Samsung Galaxy S21 has better RAM than Xiaomi Redmi 6 Pro (4GB RAM + 64GB). In terms of display resolution, Samsung Galaxy S21 has better resolution of 2400 x 1080 than Xiaomi Redmi 6 Pro (4GB RAM + 64GB) which has resolution of 2280 x 1080. Samsung Galaxy S21 has more internal memory than Xiaomi Redmi 6 Pro (4GB RAM + 64GB)
| Name | Xiaomi Redmi 6 Pro (4GB RAM + 64GB) | Samsung Galaxy S21 | 
| RAM | 4 GB | 8 GB | 
|---|---|---|
| Display | 5.84 in | 6.2 in | 
| Internal Memory | 64 GB | 128 GB | 
| Battery | 4000 mAh | 4000 mAh | 
| Camera | 12 MP + 5 MP Dual | 64 MP + 12 MP + 12 MP Triple | 
| Price | Rs. 8999 | Rs. 69999 | 
The launch Date of the first phone is September, 2018. The cost of Xiaomi Redmi 6 Pro (4GB RAM + 64GB) is Rs. 8999. The launch Date of the second phone is January 14, 2021. The cost of Samsung Galaxy S21 is Rs. 69999.
Samsung Galaxy S21 has larger screen size of 6.2 inches in comparison to Xiaomi Redmi 6 Pro (4GB RAM + 64GB)'s 5.84 inch screen. Xiaomi Redmi 6 Pro (4GB RAM + 64GB) has IPS Screen type where as Samsung Galaxy S21 has Screen type. Xiaomi's phone has display density of 432 PPI & Samsung's phone has only 421 PPI display density. Xiaomi Redmi 6 Pro (4GB RAM + 64GB) has 19:9 aspect ratio where as Samsung Galaxy S21 has 20:9 aspect ratio.
Samsung Galaxy S21's larger 8 GB RAM is better for playing games and all with respect to Xiaomi Redmi 6 Pro (4GB RAM + 64GB)'s lower 4 GB RAM. Samsung Galaxy S21 has more Internal Memory (128 GB) than Xiaomi Redmi 6 Pro (4GB RAM + 64GB) (64 GB).
They both have the same 12 MP + 5 MP Dual Rear Camera. Samsung Galaxy S21 will be better choice if you're looking to click lot of selfies as it has better 10 MP Front Camera in comparison to Xiaomi Redmi 6 Pro (4GB RAM + 64GB)'s 5 MP Front Camera.
Both the phones has Android Operating System but the first one runs on version 8.1 and the second one on 10 version.
| Name | Xiaomi Redmi 6 Pro (4GB RAM + 64GB) | Samsung Galaxy S21 | 
| General | ||
| Model | Galaxy S21 5G | |
| Sim Type | Dual Sim, GSM+GSM | Dual Sim, GSM+GSM | 
| Dual Sim | Yes | Yes | 
| Sim Size | Nano SIM | Nano+Nano SIM | 
| Device Type | Smartphone | Smartphone | 
| Release Date | September, 2018 | January 14, 2021 | 
| Design | ||
| Dimensions | 71.7 x 149.3 x 8.8 mm | 71.2 x 151.7 x 7.9 mm | 
| Weight | 178 g | 169 g | 
| Display | ||
| Type | Color IPS Screen (16M colors Colors) | Color Dynamic AMOLED 2X (16M Colors) | 
| Touch | Yes | Yes | 
| Size | 5.84 inches, 1080 x 2280 pixels | 6.2 inches, 1080 x 2400 pixels, 120 Hz | 
| Aspect Ratio | 19:9 | 20:9 | 
| PPI | ~ 432 PPI | ~ 421 PPI | 
| Screen to Body Ratio | ~ 87.2% | |
| Glass Type | Corning Gorilla Glass Victus | |
| Features | Always-on Display, HDR10+ | |
| Notch | Yes, Small Notch | Yes, Punch Hole | 
| Memory | ||
| RAM | 4 GB | 8 GB | 
| Storage | 64 GB | 128 GB | 
| Storage Type | UFS 3.1 | |
| Card Slot | Yes, upto 256 GB | |
| Connectivity | ||
| GPRS | Yes | Yes | 
| EDGE | Yes | Yes | 
| 3G | Yes | Yes | 
| 4G | Yes | Yes | 
| 5G | Yes | |
| VoLTE | Yes | Yes, Dual Stand-By | 
| Wifi | Yes, with wifi-hotspot | Yes, with wifi-hotspot | 
| Bluetooth | Yes | Yes, v5.0, A2DP, LE | 
| USB | Yes, microUSB | Yes, USB-C v3.2 | 
| USB Features | USB on-the-go, USB Charging | |
| Extra | ||
| GPS | Yes, with A-GPS Support | Yes, with A-GPS, GLONASS, BDS, GALILEO | 
| Fingerprint Sensor | Yes, Rear | Yes, In Display | 
| Face Unlock | Yes | Yes | 
| Sensors | Accelerometer, Gyroscope, Compass | Accelerometer, Gyro, Proximity, Compass, Barometer | 
| 3.5mm Headphone Jack | Yes | No | 
| NFC | Yes | |
| Water Resistance | Yes, 1.5 m upto 30 min | |
| IP Rating | IP68 | |
| Dust Resistant | Yes | |
| Camera | ||
| Rear Camera | 12 MP + 5 MP | 12 MP ƒ/1.8 (Wide Angle) 64 MP ƒ/2 (Telephoto) 12 MP ƒ/2.2 (Ultra Wide) | 
| OIS | Yes | |
| Auto Focus | Yes | |
| Features | Face detection, Smile detection, Geo tagging, Panorama, Touch to focus | Auto-HDR, Panorama | 
| Video Recording | 1080p @ 30 fps FHD | 8K @ 24 fps UHD, 4K @ 30/60 fps UHD, 1080p @ 240/30/60 fps FHD, 720p @ 960 fps HD | 
| Flash | Yes, Dual LED | Yes, LED | 
| Front Camera | 5 MP | 10 MP ƒ/2.2 (Wide Angle) Punch Hole | 
| Front Video Recording | 4K @ 30/60 fps UHD, 1080p @ 30 fps FHD | |
| Technical | ||
| OS | Android v8.1 (Oreo) | Android v10 | 
| Chipset | Qualcomm Snapdragon 625 | Samsung Exynos 2100 | 
| CPU | 2 GHz, Octa Core Processor | 2.9 GHz, Octa Core Processor | 
| Core Details | 1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55 | |
| GPU | Adreno 506 | Mali-G78 MP14 | 
| Java | Yes, via 3rd party | No | 
| Browser | Yes, supports HTML | Yes | 
| Multimedia | ||
| Supports | MMS, Instant Messaging | |
| Yes, with Push Email | Yes | |
| Music | MP3, WAV, eAAC+, FLAC | Yes | 
| Video | XviD, MP4, H.264 | Yes | 
| FM Radio | Yes | No | 
| Document Reader | Yes | Yes | 
| Battery | ||
| Type | Non-Removable Battery | Non-Removable Battery | 
| Size | 4000 mAh, Li-Po Battery | 4000 mAh, Li-Po Battery | 
| Fast Charging | Yes, 25W Fast Charging | |
| Wireless Charging | Yes, 15W | |
| Reverse Charging | Yes, 4.5W | |