Compare phones
| Global Score | |
| 83.3 | 84.1 |
| Basic Information | |
| Xiaomi | Samsung |
| Android 10, 9.0 Pie, 8.0 Oreo | Android 11, 10 |
| 2018-06-05 | 2020-03-23 |
| 6.10 x 2.94 x 0.30 inches | 6.26 x 2.96 x 0.35 inches |
| 6.17 ounces | 6.63 ounces |
| Black, Blue, Gold and White | Midnight blue and Raven black |
| Glass (Corning Gorilla Glass 5) | Plastic and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| Display / Screen | |
| 6.2 inches | 6.4 inches |
| 2248 x 1080 pixels | 2340 x 1080 pixels |
| AMOLED | Super AMOLED |
| 402 pixels per inch | 403 pixels per inch |
| 600 cd/m2 brightness | 420 cd/m2 brightness |
| No touch screen | No touch screen |
| 8.6 | 8.4 |
| Performance | |
| Qualcomm Snapdragon 845 SDM845 chipset | Exynos 9611 chipset |
| Kryo 385, 64-bit, 10 nm (Octa-Core 2800 MHz) processor | Arm Cortex-A73 and Arm Cortex-A53, 64-bit, 10 nm (Octa-Core 2300 MHz) processor |
| 6 GB RAM | 4 GB RAM |
| Adreno 630 GPU | Mali-G72 MP3 GPU |
| 9.63 | 9.27 |
| Storage | |
| 256 GB internal memory | 64 GB internal memory |
| No SD card slot | microSDXC (up to 512 GB) external memory slot |
| 13.3 | 11.74 |
| Camera | |
| 12.00 MP + 20.00 MP | 48.00 MP + 20.00 MP |
| f/1.80 aperture | f/2.00 aperture |
| 56.00mm focal length | 26.00mm focal length |
| 0.39 inches (1/2.55") sensor | 0.5 inches (1/2") sensor |
| 3840 x 2160 (30 fps) (4K) video resolution | 3840 x 2160 (30 fps) (4K) video resolution |
| 1280 x 720 (960 fps) (HD) slow motion video | 1920 x 1080 (240 fps) (Full HD) slow motion video |
| 9.9 | 11.55 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA | LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM, Dual SIM | Nano SIM, Dual SIM |
| 6.7 | 6.7 |
| Battery Life | |
| 3400mAh Li - Polymer Battery | 6000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| 5.36 | 7.52 |
| Other Features | |
| Bluetooth 5.0 | Bluetooth 5.0 |
| GPS | GPS |
| NFC | -- |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Gyroscope and Proximity Sensor |
| -- | FM Radio |
Comparison review
The Galaxy M21 is slightly better than the Xiaomi Mi 8, having a global score of 84.1 against 83.3. Galaxy M21's construction is newer than the Xiaomi Mi 8's, but it is a little heavier and somewhat thicker. Both phones in this comparison come with Android OS (operating system), but the Galaxy M21 has newer 11 version and Xiaomi Mi 8 has Android 10.
The Xiaomi Mi 8 features a bit better looking display than Galaxy M21, because although it has a little bit smaller display, a quite lower pixel number in each inch in the screen and a bit worse resolution of 1080 x 2248, it also counts with a brighter screen. Xiaomi Mi 8 counts with more storage to store more apps and games than Galaxy M21, because although it has no slot for an external memory card, it also counts with 256 GB internal storage capacity.
Xiaomi Mi 8 has a bit better performance than Galaxy M21, and although they both have a Octa-Core processing unit, the Xiaomi Mi 8 also has a greater amount of RAM. Samsung Galaxy M21 features a better camera than Xiaomi Mi 8, because although it has a tinier diafragm aperture which is not recommended for taking photographs and video in low-light situations, and they both have the same video resolution and the same 30 fps video frame rates, the Samsung Galaxy M21 also counts with a lot larger back-facing camera sensor and a back camera with a much better 48 megapixels resolution.
The Samsung Galaxy M21 counts with a way better battery lifetime than Xiaomi Mi 8, because it has a 76 percent more battery capacity.
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