Compare phones
| Global Score | |
| 76.6 | 85.5 |
| Basic Information | |
| Xiaomi | Samsung |
| Android 10 | Android 11, 10 |
| 2020-05-20 | 2019-12-27 |
| 6.39 x 3.04 x 0.35 inches | 6.24 x 2.90 x 0.31 inches |
| 7.02 ounces | 6.07 ounces |
| Forest green, Midnight gray and Polar white | Prism Crush black, Prism Crush blue, Prism Crush pink and Prism Crush white |
| Plastic | Plastic and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 283.00 | $ 282.00 |
| Display / Screen | |
| 6.5 inches | 6.5 inches |
| 2340 x 1080 pixels | 2400 x 1080 pixels |
| IPS LCD | Super AMOLED |
| 396 pixels per inch | 405 pixels per inch |
| No touch screen | No touch screen |
| 8 | 8.1 |
| Performance | |
| MediaTek Helio G85 chipset | Samsung Exynos 9611 chipset |
| Arm Cortex-A75 and ArmCortex-A55, 64-bit, 12 nm (Octa-Core 2000 MHz) processor | ARM Cortex-A73 and ARM Cortex-A53, 64-bit, 10 nm (Octa-Core 2300 MHz) processor |
| 3 GB RAM | 4 GB RAM |
| Mali G52 MC2 GPU | Mali-G72 MP3 GPU |
| 9.09 | 9.27 |
| Storage | |
| 64 GB internal memory | 128 GB internal memory |
| microSDXC (up to 128 GB) external memory slot | microSDXC (up to 512 GB) external memory slot |
| 10.02 | 14.14 |
| Camera | |
| 48.00 MP + 13.00 MP | 48.00 MP + 32.00 MP |
| f/1.80 aperture | f/2.00 aperture |
| -- | 26.00mm focal length |
| 0.5 inches (1/2") sensor | 0.5 inches (1/2") sensor |
| 1920 x 1080 (30 fps) (Full HD) video resolution | 3840 x 2160 (30 fps) (4K) video resolution |
| 1280 x 720 (120 fps) (HD) slow motion video | 1280 x 720 (240 fps) (HD) slow motion video |
| 11 | 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 | |
| 5020mAh Li - Polymer Battery | 4000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| 6.8 | 5.92 |
| Other Features | |
| Bluetooth 5.0 | Bluetooth 5.0 |
| GPS | GPS |
| NFC | NFC |
| Infra-red port | -- |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| -- | FM Radio |
Comparison review
The Galaxy A51 is better than the Xiaomi Redmi Note 9, getting an 85.5 score against 76.6. These phones use Android OS (operating system), but Galaxy A51 has a more recent 11 version while Xiaomi Redmi Note 9 has Android 10, giving some additional features. Even when Galaxy A51 and the Xiaomi Redmi Note 9 were only released 5 months apart, Galaxy A51 is lighter and somewhat thinner.
The Galaxy A51 counts with a bit faster processing unit than Xiaomi Redmi Note 9, and although they both have the same number of cores, the Galaxy A51 also has a higher amount of RAM. Samsung Galaxy A51 counts with a bit more vivid display than Xiaomi Redmi Note 9, and although they both have a same size display, the Samsung Galaxy A51 also has a little bit more pixels per screen inch and a slightly better 1080 x 2400 resolution.
Galaxy A51 has a little bit better camera than Xiaomi Redmi Note 9, because although it has a smaller camera aperture, and they both have the same resolution back camera and the same sensor size, the Galaxy A51 also counts with a much better 3840x2160 video quality. Samsung Galaxy A51 counts with much more memory capacity to store more games and applications than Xiaomi Redmi Note 9, because it has a SD memory card expansion slot that admits a maximum of 512 GB and 128 GB internal storage.
The Xiaomi Redmi Note 9 has longer battery duration than Galaxy A51, because it has a 26 percent larger battery capacity.
Samsung Galaxy A51 is not only the best phones of the ones we are comparing, but it's also cheaper than the other phone, which makes it a very good choice.
Disclaimer: As an Amazon Associate I earn from qualifying purchases.