Xiaomi Mi 9 SE (128GB) vs Samsung Galaxy S21 Ultra (SM-G998N 256GB)
Side by side comparison between Xiaomi Mi 9 SE vs Samsung Galaxy S21 Ultra phones, differences, pros, cons and full specifications. What's the better?
,
5.97"
AMOLED
AMOLED
1080x2340
48
MP
MP
20mp
6GB
RAM
RAM
Octa-core
3070
mAh
mAh
(Non removable)
vs
6.8"
AMOLED
AMOLED
1440x3200
108
MP
MP
40mp
12GB
RAM
RAM
Octa-core
5000
mAh
mAh
(Non removable)
What's the better phone? Samsung Galaxy S21 Ultra (SM-G998N 256GB)
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!
25 Common items in both devices |
Aluminum frame, glass front/back |
Super AMOLED / Dynamic AMOLED |
16 million |
LDAF/PDAF: laser/phase detection autofocus / PDAF: phase detection autofocus on both cameras |
HDR photo on both cameras / HDR photo/video on both cameras |
f/1.8 (aperture) |
Capacitive |
+18 specs and more in the table below |
Check the comparison table below for more items that are not evaluated in comparison score above.
Highlight differences Clear highlight📱 Model features | ||
Xiaomi Mi 9 SE (128GB) | Galaxy S21 Ultra (SM-G998N 256GB) | |
Model | Xiaomi Mi 9 SE (128GB) | Galaxy S21 Ultra (SM-G998N 256GB) |
Other model names | 小米9 SE M1903F2G, M1903F2A, Xiaomi Grus | 갤럭시 S21 Ultra 5G (SM-G998N Single-SIM) |
Country or region available | ![]() ![]() (Global, International), China | ![]() South Korea |
Brand | Xiaomi | Samsung |
Release date | 3/1/2019, Announced: 2/20/2019 | 1/29/2021, Announced: 1/14/2021 |
Depth | 7.45 millimeters (0.29 inches) | 8.9 millimeters (0.35 inches) |
Size (width x height) | 70.5 x 147.5 millimeters (2.78 x 5.81 in) | 75.6 x 165.1 millimeters (2.98 x 6.5 in) |
Weight | 155 grams (5.43 ounces) | 227 grams (7.95 ounces) |
Build, materials | Aluminum frame, glass front/back | Aluminum frame, glass front/back |
Protection against water and others | Not supported | IP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistant |
📲 Display | ||
Xiaomi Mi 9 SE (128GB) | Galaxy S21 Ultra (SM-G998N 256GB) | |
Display type | Super AMOLED | Dynamic AMOLED |
Screen size | 5.97" inches | 6.8" inches |
Screen-to-body ratio | ~84.1% (screen-to-body ratio) | ~89.4% (screen-to-body ratio) |
Display resolution | 1080x2340 pixels (19.5:9) | 1440x3200 pixels (20:9) |
Touchscreen | Capacitive Multitouch | Capacitive Multitouch 10-points |
Pixel density (dot pitch) | 432 PPI | 516 PPI |
Colors | 16 million | 16 million |
Scratch-resistant glass | Gorilla Glass 5 | Gorilla Glass Victus |
Refresh rate | 60Hz | 120Hz |
Display features | HDR8 | 1500nits[peak] HDR10+ Always-On Display |
🤖 Operating System | ||
Xiaomi Mi 9 SE (128GB) | Galaxy S21 Ultra (SM-G998N 256GB) | |
System version | Android 9.0 Pie | Android 11 |
Firmware update | Android 11 | Android 15 |
User Interface | MIUI 10 / 11 / 12.5 | One UI 3.1 / 4.1 / 5.1 / 6.0 / 7.0 |
⚙️ Processor | ||
Xiaomi Mi 9 SE (128GB) | Galaxy S21 Ultra (SM-G998N 256GB) | |
Chipset | 64bit: Qualcomm Snapdragon 712 (SDM712) (10nm) | 64bit: Samsung Exynos 2100 (5nm) |
CPU | Octa-core, 2 processors: 2x 2.3GHz Kryo 360 Gold (Dual-core) 6x 1.7GHz Kryo 360 Silver (Hexa-core) | Octa-core, 3 processors: 1x 2.9GHz ARM Cortex-X1 (Single-core) 3x 2.8GHz ARM Cortex-A78 (Triple-core) 4x 2.2GHz ARM Cortex-A55 (Quad-core) |
GPU graphical controller | Qualcomm Adreno 616 (610MHz) | ARM Mali-G78 MP14 (854MHz) |
Performance (benchmark) | AnTuTu: 180057 (v7) Geekbench: 6017 (v4.4) GFXBench: 14fps (ES 3.1 onscreen) | AnTuTu: 657150 (v8), 727634 (v9) Geekbench: 3457 (v5.2) GFXBench: 51fps (ES 3.1 onscreen) |
💽 Memory and storage | ||
Xiaomi Mi 9 SE (128GB) | Galaxy S21 Ultra (SM-G998N 256GB) | |
RAM memory | 6GB LPDDR4X | 12GB LPDDR5 |
Internal storage | 128GB (109GB available) UFS 2.0 | 256GB (220GB available) UFS 3.1 |
External storage | Not supported | Not supported |
📶 Mobile networks | ||
Xiaomi Mi 9 SE (128GB) | Galaxy S21 Ultra (SM-G998N 256GB) | |
Dual-SIM | Dual-SIM Standby - Call active on one sim card | Not supported |
SIM card | 2 slots (Dual-SIM) nano-SIM (4FF) | 1 slot (Single-SIM) nano-SIM (4FF) |
Maximum Download / Upload | 800/150 Mbps | 5000/1920 Mbps |
Network technology | 2G, 3G, 4G | 2G, 3G, 4G, 5G |
Frequency, bands | Expand band details Collapse details | |
GSM MHz band | Quad-Band 850/900/1800/1900 | Quad-Band 850/900/1800/1900 |
Primary 2G network | CDMA 800, GSM 850/900/1800/1900 | GSM 850/900/1800/1900 |
Primary 3G network | CDMA2000 1xEV-DO TD-SCDMA 1900/2000 UMTS 850/900/1900/2100 | UMTS 850/900/1700/1900/2100 |
Primary 4G network | LTE Cat15 (1, 3, 5, 7, 8) TD-LTE (34, 38, 39, 40, 41) VoLTE | LTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 66) TD-LTE (38, 39, 40, 41) VoLTE |
Primary 5G network | Not supported | SA/NSA/Sub6 (77, 78) |
Primary data network | GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, TD-SCDMA, UMTS, TD-HSDPA, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA |
Secondary 2G network | GSM 850/900/1800/1900 | Not supported |
Secondary 3G network | UMTS 850/900/1900/2100 | Not supported |
Secondary 4G network | LTE Cat15 (1, 3, 5, 7, 8) TD-LTE (34, 38, 39, 40, 41) VoLTE | Not supported |
Secondary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A | Not supported |
📷 Camera | ||
Xiaomi Mi 9 SE (128GB) | Galaxy S21 Ultra (SM-G998N 256GB) | |
Back camera (main camera) | (triple camera) 48 megapixels 13MP ultrawide f/2.41.12µm 8MP telephoto f/2.41.12µmPDAF | (quad camera) 108 megapixels 10MP periscope telephoto f/4.9240mm1/3.24"1.22µmPDAFOIS10x-optical-zoom 10MP telephoto f/2.470mm1/3.24"1.22µmPDAFOIS3x-optical-zoom 12MP ultrawide f/2.213mm1/2.55"1.4µmPDAFSuper-Steady-video |
Main camera resolution | 8000x6000 pixels | 12000x9000 pixels |
Video recording (primary) | 4K UHD (3840x2160) 30 fps | 8K UHD (7680x4320) 24 fps |
Flash | Dual-LED flash | LED flash |
Focal aperture | f/1.8 (aperture) | f/1.8 (aperture) |
Focal length | feature not registered | 26mm (lens) |
Sensor size | 1/2" inches | 1/1.33" inches |
Pixel size | 0.8µm pixel | 1.8µm pixel |
Autofocus | LDAF/PDAF: laser/phase detection autofocus | PDAF: phase detection autofocus on both cameras |
Touch focus | Supported | Supported |
Image stabilization | EIS: Digital stabilization | OIS: Optical stabilization |
Zoom | Only digital zoom | Digital and optical zoom |
Face/smile detection | Face detection, Smile detection | Face detection, Smile detection |
BSI sensor | Not supported | Supported |
HDR | HDR photo on both cameras | HDR photo/video on both cameras |
Camera extras | feature not registered | 4K@60fps 1080p@240fps 720p@960fps |
📸 Front camera | ||
Xiaomi Mi 9 SE (128GB) | Galaxy S21 Ultra (SM-G998N 256GB) | |
Front camera (secondary) | 20 megapixels | 40 megapixels |
Front camera resolution | 5184x3840 pixels | 7296x5472 pixels |
Video recording (secondary) | Full HD (1920x1080) | 4K UHD (3840x2160) |
Front flash | Not supported | Not supported |
Focal aperture | f/2.0 (aperture) | f/2.2 (aperture) |
Focal length | feature not registered | 26mm (lens) |
Sensor size | feature not registered | 1/2.8" inches |
Pixel size | 0.9µm pixel | 0.7µm pixel |
🔉 Sound and multimedia | ||
Xiaomi Mi 9 SE (128GB) | Galaxy S21 Ultra (SM-G998N 256GB) | |
Loudspeaker | Mono sound (not stereo) | Stereo sound 32-bit/384kHz Dolby Atmos Tuned by AKG |
Active noise cancellation | 2 microphones or more | 3 microphones |
Radio | Not supported | FM |
TV | Not supported | Not supported |
Video formats | MP4, H.265, H.264, H.263, XviD, MKV | MP4, H.265, H.264, H.263, XviD, MKV |
Audio formats | MP3, WAV, WMA, eAAC+, FLAC | MP3, WAV, WMA, eAAC+, FLAC |
🔌 Connectivity | ||
Xiaomi Mi 9 SE (128GB) | Galaxy S21 Ultra (SM-G998N 256GB) | |
USB | USB 2.0 Type-C, USB OTG On-The-Go | USB 3.2 Type-C, USB OTG On-The-Go |
Audio output | Type-C jack with 3.5mm jack adapter | Type-C reversible connector |
TV output | USB Type-C (reversible) | USB Type-C (reversible) |
Bluetooth | 5.0 + A2DP/LE | 5.2 + A2DP/LE |
WiFi | 802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot | 802.11 a/b/g/n/ac/ax [wifi6] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot |
DLNA | Supported | Supported |
GPS | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou |
NFC | Supported | Supported |
Infrared port | Supported | Not supported |
🧭 Sensors | ||
Xiaomi Mi 9 SE (128GB) | Galaxy S21 Ultra (SM-G998N 256GB) | |
Sensors | Accelerometer Ambient light sensor Compass Face unlock 2D Fingerprint sensor (under display) Gyroscope Virtual proximity sensor | Accelerometer Ambient light sensor Barometer Compass Face unlock 2D Fingerprint sensor (under display) Gesture Gyroscope Hall effect Proximity sensor UWB (Ultra Wideband) |
Vibrating alert | Supported | Supported |
🔋 Battery | ||
Xiaomi Mi 9 SE (128GB) | Galaxy S21 Ultra (SM-G998N 256GB) | |
Battery type | LiPo: li-ion polymer (Non removable) | LiPo: li-ion polymer (Non removable) |
Battery capacity | 3070 mAh | 5000 mAh |
Charger, watts | 18W Wired fast charging | 25W Wired fast charging USB Power Delivery 3.0 |
Inductive / wireless charging | Not supported | 15W Qi wireless charging (Qi/PMA) 4.5W Reverse wireless charging |
Talk time autonomy | feature not registered | feature not registered |
Standby | feature not registered | feature not registered |
➕ Other features | ||
Xiaomi Mi 9 SE (128GB) | Galaxy S21 Ultra (SM-G998N 256GB) | |
Call control | Voice dialing, Voice recorder, Voice commands | Voice dialing, Voice recorder, Voice commands |
Messaging | SMS (T9), MMS, E-mail, Push mail | SMS (T9), MMS, E-mail, Push mail |
Hands-free calling | Supported | Supported |
Video calling | Supported | Supported |
Ringtones | Polyphonic and customized | Polyphonic and customized |
Web browser | HTML, XHTML, HTML5 | HTML, XHTML, HTML5 |
Antenna | Internal antenna | Internal antenna |
Qwerty physical keyboard | Not supported | Not supported |
Miscellaneous | • Colors: Gray, Violet, Blue | • Colors: Phantom Black, Silver, Titanium, Navy, Brown • Samsung Pay (Visa, MasterCard) • Samsung DeX • Stylus pen support |
☢️ Radiation rate | ||
Xiaomi Mi 9 SE (128GB) | Galaxy S21 Ultra (SM-G998N 256GB) | |
SAR 1.6W/kg (USA, Mexico, etc.) | 1.39W/kg (head), 1.39W/kg (body) | 0.489W/kg (head), 1.1W/kg (body) |
SAR 2W/kg (Europe, UK, etc.) | 1.19W/kg (head), 1.17W/kg (body) | feature not registered |