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Samsung Galaxy S21 Ultra vs Xiaomi Redmi Note 9 (128GB/6GB)

Side by side comparison between Samsung Galaxy S21 Ultra vs Xiaomi Redmi Note 9 phones, differences, pros, cons with full specifications. What's the better?

,
Samsung Galaxy S21 Ultra
6.8"
AMOLED

1440x3200

108
MP

40mp

12GB
RAM

64bit Octa

5000
mAh

(Non removable)

vs
04PointsXiaomi Redmi Note 9 (128GB/6GB)Compare Samsung Galaxy S21 Ultra X
Xiaomi Redmi Note 9 (128GB/6GB)
6.53"
IPS

1080x2340

48
MP

13mp

6GB
RAM

64bit Octa

5020
mAh

(Non removable)

What's the better phone? Samsung Galaxy S21 Ultra

The phonemore's choice is much more technical than personal. Therefore, you shouldn't only consider this. Our goal is to help you, but what's important to us may not be important to you. You decide which one is the best! Comment!

Galaxy S21 Ultra31 Advantages Samsung Galaxy S21 UltravsRedmi Note 9 (128GB/6GB)4 Advantages Xiaomi Redmi Note 9 (128GB/6GB)
+2.9Ghz 64bit Octa-Core43%
More powerful processor, you can open your applications faster
vs2Ghz 64bit Octa-Core
+12GB LPDDR5100%
More RAM memory. Typically more responsive and better for multitasking.
vs6GB LPDDR4X
+UFS 3.1Advantage
Fastest write and read storage.
vseMMC 5.1
+Aluminum frame, glass front/backAdvantage
More resistant material
vsPlastic body, glass front
+Dynamic AMOLEDAdvantage
Dynamic AMOLED display is brighter and more vivid
vsTFT IPS LCD
+HDR10+Advantage
The HDR10+ display provides vibrant colors and more details
vsNot supported
+120Hz100%
The display reproduces more frames per second because the frequency (Hertz) is higher, improves fluidity and tires your eyes less.
vs60Hz
+1440x3200 pixels82%
Higher resolution screen
vs1080x2340 pixels
+516 PPI31%
Crisper display of text, images and videos because it has more pixels per inch (ppi)
vs395 PPI
+6.8"4%
Larger screen
vs6.53"
+(quad camera) 108MP + 10MP + 10MP + 12MP133%
Higher resolution main camera
vs(quad camera) 48MP + 8MP + 2MP + 2MP
+Digital and optical zoomAdvantage
The zoom allows for better focus and approach to take pictures
vsOnly digital zoom
+OIS: Optical stabilizationAdvantage
Image stabilization prevents blurry photos and helps in recording motion video
vsEIS: Digital stabilization
+BSI sensorAdvantage
The BSI sensor allows the entry of more light generating photos with more detail and brightness
vsNot supported
+1/1.33" inches50%
The larger sensor camera lets you take photos with better depth.
vs1/2" inches
+(front) 40MP2 times
Higher resolution secondary camera to take pictures and selfies
vs(front) 13MP
+8K UHD (7680x4320)15 times
More image quality for recording videos with the primary camera
vsFull HD (1920x1080)
+(front) 4K UHD (3840x2160)3 times
More image quality for recording videos with the secondary camera
vs(front) Full HD (1920x1080)
+5G NRAdvantage
The 5G NR network is newer and faster
vs4G+ LTE-A
+(5G NR) 5000 Mbps5 times
Faster for surfing the internet and download files
vs(4G+ LTE-A) 800 Mbps
+BarometerAdvantage
Sensors help you use the device
vsNot supported
+ANT+Advantage
Sensors help you use the device
vsNot supported
+25W39%
More power (watts) to charge the battery faster. Sometimes, the charger that comes with the device doesn't have the same power supported by the device. Check before you buy it.
vs18W
+Qi wireless charging (Qi/PMA)Advantage
Wireless charging is another way to charge the battery.
vsNot supported
+2 slots (Dual-SIM) + e-SIM (Eletronic)Advantage
More SIM card slots. You can choose more carriers.
vs2 slots (Dual-SIM)
(dedicated slot)
+802.11 a/b/g/n/ac/ax wifi6 (2.4Ghz, 5Ghz) + MIMOAdvantage
WiFi 802.11 a/b/g/n/ac/ax wifi6 (2.4Ghz, 5Ghz) + MIMO is newer and faster
vs802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO
+DLNAAdvantage
With DLNA technology you can access and play media files on TV, tablet or DLNA compatible device.
vsNot supported
+5.2 + A2DP/LEAdvantage
Bluetooth 5.2 + A2DP/LE is newer and faster
vs5.0 + A2DP/LE
+NFCAdvantage
NFC allows you to make payments by approach quickly and securely
vsNot supported
+USB 3.2 Type-C, USB OTG On-The-GoAdvantage
Newer and faster USB version for transferring photos, mp3 or data.
vsUSB 2.0 Type-C, USB OTG On-The-Go
+IP68 certifiedAdvantage
Protection against water allows you talk to your friends in the rain, for example
vsWater repellent nano-coating (don't immerse)
Not supportedvs+Until 512GB microSD, microSDXCAdvantage
More external storage for files using memory cards
227 grams (7.95 ounces)vs+199 grams (6.97 ounces)14%
Lighter
Type-C reversible connectorvs+3.5mm jackAdvantage
Headsets with 3.5mm Jack size are more common and easy to find in stores
5000 mAhvs+5020 mAh1%
Battery - higher amperage (mAh) allows more device usage time, but it also depends on the hardware and use

26 Common items in both devices
128GB (104GB available) / 128GB (106GB available)
8.9 millimeters (0.35 inches)
16 million
LED flash
PDAF: phase detection autofocus on both cameras / PDAF: phase detection autofocus
HDR photo/video on both cameras / HDR photo on both cameras
f/1.8 (aperture)
+19 specs and more in the table below

Check the comparison table below for more items that are not evaluated in comparison score above.

Highlight differencesClear highlight
Physical featuresSamsung Galaxy S21 UltraXiaomi Redmi Note 9 (128GB/6GB)
ModelGalaxy S21 UltraRedmi Note 9 (128GB/6GB)
Other model namesGalaxy S21 Ultra 5G SM-G998B/DSXiaomi Redmi Note 9 M2003J15SC, M2003J15SS
Country or region available(Global, International)
(Global, International)
ChinaIndia
China, India
BrandSamsungXiaomi
Release dateJanuary, 2021April, 2020
Depth8.9 millimeters (0.35 inches)8.9 millimeters (0.35 inches)
Size (width x height)75.6 x 165.1 millimeters (2.98 x 6.5 in)77.2 x 162.3 millimeters (3.04 x 6.39 in)
Weight227 grams (7.95 ounces)199 grams (6.97 ounces)
Qwerty physical keyboardNot supportedNot supported
AntennaInternal antennaInternal antenna
Build, materialsAluminum frame, glass front/backPlastic body, glass front
Protection against water and othersIP68 certified: dust proof and waterproof over 1.5 meter and 30minWater repellent nano-coating (don't immerse)
System (OS)Samsung Galaxy S21 UltraXiaomi Redmi Note 9 (128GB/6GB)
Operating systemAndroid 11Android 10
Firmware updatefeature not registeredAndroid 11
HardwareSamsung Galaxy S21 UltraXiaomi Redmi Note 9 (128GB/6GB)
Chipset64bit - Samsung Exynos 2100 (5nm)64bit - MediaTek Helio G85 (12nm)
CPU processorOcta-Core, 3 processors:
2.9Ghz Single-Core ARM Cortex-X1
2.8Ghz 3-Cores ARM Cortex-A78
2.2Ghz Quad-Core ARM Cortex-A55
Octa-Core, 2 processors:
2Ghz Dual-Core ARM-Cortex-A75
1.8Ghz Hexa-Core ARM-Cortex-A55
GPU graphical controllerARM Mali-G78 MP14ARM Mali-G52 MC2 1Ghz
RAM memory12GB LPDDR56GB LPDDR4X
Internal storage128GB (104GB available)
UFS 3.1
128GB (106GB available)
eMMC 5.1
External storageNot supportedUntil 512GB microSD, microSDXC
(dedicated slot)
DisplaySamsung Galaxy S21 UltraXiaomi Redmi Note 9 (128GB/6GB)
Display typeDynamic AMOLEDTFT IPS LCD
Screen size6.8" inches6.53" inches
Screen-to-body ratio~89.4% (screen-to-body ratio)~83.5% (screen-to-body ratio)
Display resolution1440x3200 pixels (20:9)1080x2340 pixels (19.5:9)
TouchscreenCapacitive Multitouch 10-pointsCapacitive Multitouch
Pixel density (dot pitch)516 PPI395 PPI
Colors16 million16 million
Scratch-resistant glassGorilla Glass VictusGorilla Glass 5
Display features120Hz, 1500 nits, HDR10+60Hz, 450 nits
Mobile networksSamsung Galaxy S21 UltraXiaomi Redmi Note 9 (128GB/6GB)
Dual-SIMDual-SIM Standby - Call active on one sim cardDual-SIM Standby - Call active on one sim card
(dedicated slot)
SIM card2 slots (Dual-SIM)
nano-SIM (4FF) + e-SIM
2 slots (Dual-SIM)
nano-SIM (4FF)
Maximum download/upload5000/1920 Mbps800/150 Mbps
Network technology2G, 3G, 4G, 5G2G, 3G, 4G
Frequency, bandsExpand band detailsCollapse details
GSM Mhz bandQuad-Band 850/900/1800/1900Quad-Band 850/900/1800/1900
Primary 2G networkCDMA 800/1900, GSM 850/900/1800/1900GSM 850/900/1800/1900
Primary 3G networkCDMA2000 1xEV-DO
TD-SCDMA 1900/2000
UMTS 850/900/1700/1900/2100
UMTS 850/900/1700/1900/2100
Primary 4G networkLTE Cat24 ()
TD-LTE ()
VoLTE
LTE Cat15/13 (Bands 1, 2, 3, 4, 5, 7, 8, 20, 28)
TD-LTE (Bands 38, 40, 41)
VoLTE
Primary 5G networkSA/NSA/Sub6 ()Not supported
Primary data networkGPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, TD-SCDMA, UMTS, TD-HSDPA, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, 5G SA/NSA, 5G NRGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A
Secondary 2G networkGSM 850/900/1800/1900GSM 850/900/1800/1900
Secondary 3G networkNot supportedNot supported
Secondary 4G networkNot supportedNot supported
Secondary data networkGPRS, EDGEGPRS, EDGE
CallingSamsung Galaxy S21 UltraXiaomi Redmi Note 9 (128GB/6GB)
MessagingSMS (T9), MMS, E-mail, Push mailSMS (T9), MMS, E-mail, Push mail
SpeakerphoneSupportedSupported
Video callingSupportedSupported
Call controlVoice dialing, Voice recorder, Voice commandsVoice dialing, Voice recorder, Voice commands
CameraSamsung Galaxy S21 UltraXiaomi Redmi Note 9 (128GB/6GB)
Back camera (main camera)(quad camera)
108 megapixels
10MP periscope telephotof/4.9240mm1/3.24"1.22µmPDAFOIS10x-optical-zoom
10MP telephotof/2.470mm1/3.24"1.22µmPDAFOIS3x-optical-zoom
12MP ultrawidef/2.213mm1/2.55"1.4µmPDAFSuper-Steady-video
(quad camera)
48 megapixels
8MP ultrawidef/2.213mm1/4"1.12µm118º
2MP macrof/2.41.75µmAF
2MP depthf/2.41/5"1.7µm
Main camera resolution12000x9000 pixels8000x6000 pixels
Video recording (primary)8K UHD (7680x4320) 24 fpsFull HD (1920x1080) 30 fps
FlashLED flashLED flash
Focal aperturef/1.8 (aperture)f/1.8 (aperture)
Focal length26mm lens26mm lens
Sensor size1/1.33" inches1/2" inches
Pixel size1.8µm pixel0.8µm pixel
AutofocusPDAF: phase detection autofocus on both camerasPDAF: phase detection autofocus
Touch focusSupportedSupported
Image stabilizationOIS: Optical stabilizationEIS: Digital stabilization
ZoomDigital and optical zoomOnly digital zoom
Face/smile detectionFace detection, Smile detectionFace detection, Smile detection
BSI sensorSupportedNot supported
HDRHDR photo/video on both camerasHDR photo on both cameras
2ª cameraSamsung Galaxy S21 UltraXiaomi Redmi Note 9 (128GB/6GB)
Front camera (secondary)40 megapixels13 megapixels
Front camera resolution7296x5472 pixels4128x3096 pixels
Video recording (secondary)4K UHD (3840x2160)Full HD (1920x1080)
Front flashNot supportedNot supported
Focal aperturef/2.2 (aperture)f/2.3 (aperture)
Focal length26mm lens29mm lens
Sensor size1/2.8" inches1/3.06" inches
Pixel size0.7µm pixel1.12µm pixel
MultimediaSamsung Galaxy S21 UltraXiaomi Redmi Note 9 (128GB/6GB)
RadioFMFM
TVNot supportedNot supported
Video formatsMP4, H.265, H.264, H.263, XviD, MKVMP4, H.265, H.264, H.263, XviD, MKV
Audio formatsMP3, WAV, WMA, eAAC+, FLACMP3, WAV, WMA, eAAC+, FLAC
ConnectivitySamsung Galaxy S21 UltraXiaomi Redmi Note 9 (128GB/6GB)
USBUSB 3.2 Type-C, USB OTG On-The-GoUSB 2.0 Type-C, USB OTG On-The-Go
TV outputUSB Type-C (reversible)Not supported
Audio outputType-C reversible connector3.5mm jack
Bluetooth5.2 + A2DP/LE5.0 + A2DP/LE
WiFi802.11 a/b/g/n/ac/ax wifi6 (2.4Ghz, 5Ghz) + MIMO802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO
DLNASupportedNot supported
NFCSupportedNot supported
GPSA-GPS, GeoTagging, GLONASS, GALILEO, BeiDouA-GPS, GeoTagging, GLONASS, GALILEO, BeiDou
Infrared portNot supportedSupported
Other functionsSamsung Galaxy S21 UltraXiaomi Redmi Note 9 (128GB/6GB)
Active noise cancellationSupportedSupported
Vibrating alertSupportedSupported
RingtonesPolyphonic and customizedPolyphonic and customized
Web browserHTML, XHTML, HTML5HTML, XHTML, HTML5
SensorsAccelerometer
Proximity sensor
Compass
Ambient Light sensor
Gyroscope
Barometer
Gesture
Hall effect
Face unlock
Fingerprint sensor (under display)
ANT+
Accelerometer
Proximity sensor
Compass
Ambient Light sensor
Gyroscope
Face unlock
Fingerprint sensor (rear-mounted)
Other features- Colors: Phantom Black, Silver, Titanium, Navy, Brown
- One UI 3.1
- Always-on display
- Tuned by AKG
- 32-bit/384kHz audio
- Samsung Pay (Visa, MasterCard)
- Samsung DeX
- Stylus pen support
- WiFi direct, hotspot
- Colors: Forest Green, Midnight Grey, Polar White
- MIUI 11, 12
- 22.5W charger (18W phone support)
- WiFi direct, hotspot
Power supplySamsung Galaxy S21 UltraXiaomi Redmi Note 9 (128GB/6GB)
BatteryLiPo: Li-Ion polymer (Non removable)LiPo: Li-Ion polymer (Non removable)
Battery capacity5000 mAh5020 mAh
Charger, watts25W Fast battery charging
15W Qi wireless charging (Qi/PMA)
4.5W Reverse wireless charging between devices
USB Power Delivery 3.0
18W Fast battery charging
9W Reverse charging USB between devices
Talk time autonomyfeature not registered1980 minutes | 33 hours | 1.4 days
Standbyfeature not registeredfeature not registered
Radiation rateSamsung Galaxy S21 UltraXiaomi Redmi Note 9 (128GB/6GB)
SAR 1.6W/kg (USA, Mexico, etc.)feature not registered0.84W/kg (head) | 0.9W/kg (body)
SAR 2W/kg (Europe, UK, etc.)0.714W/kg (head) | 1.58W/kg (body)0.8W/kg (head) | 1.14W/kg (body)
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