| Global Score | |
| 84.1 | 81.2 |
| Basic Information | |
| Samsung | Samsung |
| Android 11, 10 | Android 5.0, 4.4.4, 4.4, 4.3 |
| 2020-03-23 | 2013-09-04 |
| 6.26 x 2.96 x 0.35 inches | 5.95 x 3.12 x 0.33 inches |
| 6.63 ounces | 5.93 ounces |
| Midnight blue and Raven black | Black, Pink and White |
| Plastic and Plastic | -- |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| -- | $ 265.00 |
| Display / Screen | |
| 6.4 inches | 5.7 inches |
| 2340 x 1080 pixels | 1080 x 1920 pixels (Full HD) |
| Super AMOLED | Super AMOLED |
| 403 pixels per inch | 386 pixels per inch |
| 420 cd/m2 brightness | -- |
| No touch screen | Capacitive, Multi-touch |
| 8.4 | 8.9 |
| Performance | |
| Exynos 9611 chipset | Qualcomm Snapdragon 800 MSM8974 chipset |
| Arm Cortex-A73 and Arm Cortex-A53, 64-bit, 10 nm (Octa-Core 2300 MHz) processor | Krait 400 (Quad-Core 2300 MHz) processor |
| 4 GB RAM | 3 GB (800 MHz) RAM |
| Mali-G72 MP3 GPU | Adreno 330 (450 MHz) GPU |
| 9.27 | 9.27 |
| Storage | |
| 64 GB internal memory | 64 GB internal memory |
| microSDXC (up to 512 GB) external memory slot | microSD, microSDHC (up to 64 GB) external memory slot |
| 11.74 | 9.46 |
| Camera | |
| 48.00 MP + 20.00 MP | 13.00 MP + 2.00 MP |
| f/2.00 aperture | f/2.20 aperture |
| 26.00mm focal length | 31.00mm focal length |
| 0.5 inches (1/2") sensor | 0.33 inches (1/3.06") 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 | 9.68 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA | LTE (4G), HSPA+ (4G), HSDPA, HSUPA, UMTS, EDGE, GPRS, GSM and CDMA |
| Nano SIM, Dual SIM | Micro SIM, Dual SIM |
| 6.7 | 7.1 |
| Battery Life | |
| 6000mAh Li - Polymer Battery | 3200mAh Li-Ion Battery |
| Non-Removable Battery | Removable Battery |
| -- | Wireless Charging |
| -- | 528 hours standby time 25 hours talk time |
| 7.52 | 5.2 |
| Other Features | |
| Bluetooth 5.0 | Bluetooth 4.0 |
| GPS | GPS |
| -- | NFC |
| -- | Infra-red port |
| Fingerprint ID Scanner | -- |
| Accelerometer, Gyroscope and Proximity Sensor | Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| FM Radio | -- |
Samsung Galaxy M21 has a score of 84.1, which is a little bit better than the Samsung Galaxy Note 3's 81.2 global score. These devices come with Android OS (operating system), but Samsung Galaxy M21 has a newer 11 version and Samsung Galaxy Note 3 has Android 5.0, giving you a lot of extra features. The Samsung Galaxy M21 is a incredibly newer device than the Samsung Galaxy Note 3, but it is heavier and just a little bit thicker.
Galaxy Note 3 counts with a bit sharper screen than Samsung Galaxy M21, although it has a little worse 1920 x 1080 pixels resolution, a quite smaller display and a just a little less pixels per display inch. Galaxy Note 3's processing unit is very similar to Galaxy M21's processor, because although the Galaxy Note 3 has an inferior number of cores and a lower amount of RAM memory, it also counts with a graphics processor.
The Galaxy M21 counts with a very superior memory to store more apps and games than Galaxy Note 3, and although they both have exactly the same internal memory capacity, the Galaxy M21 also has a slot for an SD memory card that admits up to 512 GB. Galaxy M21 counts with a much better battery performance than Galaxy Note 3, because it has 6000mAh of battery capacity.
Samsung Galaxy M21 features a much better camera than Galaxy Note 3, and although they both have the same video frame rates and the same 3840x2160 (4K) video resolution, the Samsung Galaxy M21 also has a much higher 48 mega pixels resolution back-facing camera, a way larger back-facing camera sensor which offers a much higher image and video quality and a larger camera aperture to capture better low-light photos and video.
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