| Global Score | |
| 84.1 | 76.3 |
| Basic Information | |
| Samsung | Samsung |
| Android 11, 10 | Android 4.4.4 |
| 2020-03-23 | -- |
| 6.26 x 2.96 x 0.35 inches | 5.21 x 2.58 x 0.26 inches |
| 6.63 ounces | 4.06 ounces |
| Midnight blue and Raven black | Black, Blue, Gold, Gray and White |
| Plastic and Plastic | -- |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| -- | $ 320.00 |
| Display / Screen | |
| 6.4 inches | 4.7 inches |
| 2340 x 1080 pixels | 720 x 1280 pixels (HD) |
| Super AMOLED | Super AMOLED |
| 403 pixels per inch | 312 pixels per inch |
| 420 cd/m2 brightness | -- |
| No touch screen | Capacitive, Multi-touch |
| 8.4 | 8.4 |
| Performance | |
| Exynos 9611 chipset | Qualcomm Snapdragon 801 chipset |
| Arm Cortex-A73 and Arm Cortex-A53, 64-bit, 10 nm (Octa-Core 2300 MHz) processor | Krait 400 (Quad-Core 2500 MHz) processor |
| 4 GB RAM | 2 GB (933 MHz) RAM |
| Mali-G72 MP3 GPU | Adreno 330 (450 MHz) GPU |
| 9.27 | 9.36 |
| Storage | |
| 64 GB internal memory | 32 GB internal memory |
| microSDXC (up to 512 GB) external memory slot | No SD card slot |
| 11.74 | 5.8 |
| Camera | |
| 48.00 MP + 20.00 MP | 12.00 MP + 2.10 MP |
| f/2.00 aperture | f/2.20 aperture |
| 26.00mm focal length | 31.00mm focal length |
| 0.5 inches (1/2") sensor | -- |
| 3840 x 2160 (30 fps) (4K) video resolution | 3840 x 2160 (30 fps) (4K) video resolution |
| 1920 x 1080 (240 fps) (Full HD) slow motion video | 1280 x 720 (120 fps) (HD) slow motion video |
| 11.55 | 9.46 |
| 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, EDGE, GPRS and GSM |
| Nano SIM, Dual SIM | Nano SIM |
| 6.7 | 7 |
| Battery Life | |
| 6000mAh Li - Polymer Battery | 1860mAh Li-Ion Battery |
| Non-Removable Battery | Removable Battery |
| -- | 11 hours talk time |
| 7.52 | 3.76 |
| Other Features | |
| Bluetooth 5.0 | Bluetooth 4.0 |
| GPS | GPS |
| -- | NFC |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Gyroscope and Proximity Sensor | Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| FM Radio | -- |
Samsung Galaxy M21 is much better than Samsung Galaxy Alpha, getting a global score of 84.1 against 76.3. These devices come with Android OS (Operating System), but Samsung Galaxy M21 has the previous 11 version and Samsung Galaxy Alpha has Android 4.4.4 version. Although it's the best cellphone in this comparison review, Samsung Galaxy M21's design is notably heavier and much thicker than the Samsung Galaxy Alpha.
The Galaxy M21 and the Galaxy Alpha count with extremely similar displays, although the Galaxy Alpha has a way smaller screen, a lot lower 1280 x 720 resolution and a bit lower display density. The Galaxy M21 has much more storage to store more games and applications than Samsung Galaxy Alpha, because it has 64 GB internal storage capacity and a slot for an SD memory card that allows up to 512 GB.
Galaxy Alpha has a little better performance than Galaxy M21, because although it has a lower number of cores and a smaller amount of RAM, it also counts with an additional graphics co-processor. The Galaxy M21 counts with a lot better camera than Galaxy Alpha, and although they both have the same video resolution and the same video frame rate, the Galaxy M21 also has a larger camera aperture to capture better photography and video in low-light environments and a much more mega-pixels camera in the back.
Samsung Galaxy M21 has a very superior battery life than Galaxy Alpha, because it has a 223 percent more battery size.
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