Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) has better RAM than Samsung Galaxy S21 Plus 5G (8GB RAM + 256GB). In terms of display resolution, Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) has better resolution of 3200 x 1440 than Samsung Galaxy S21 Plus 5G (8GB RAM + 256GB) which has resolution of 2400 x 1080. Samsung Galaxy S21 Plus 5G (8GB RAM + 256GB) has more internal memory than Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB)
| Name | Samsung Galaxy S21 Plus 5G (8GB RAM + 256GB) | Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) | 
| RAM | 8 GB | 12 GB | 
|---|---|---|
| Display | 6.7 in | 6.8 in | 
| Internal Memory | 256 GB | 128 GB | 
| Battery | 4800 mAh | 5000 mAh | 
| Camera | 64 MP + 12 MP + 12 MP Triple | 108 MP Quad | 
| Price | Rs. 85999 | Rs. 101999 | 
The launch Date of the first phone is January 14, 2021. The cost of Samsung Galaxy S21 Plus 5G (8GB RAM + 256GB) is Rs. 85999. The launch Date of the second phone is January 14, 2021. The Expected cost of Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) is Rs. 101999.
Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) has larger screen size of 6.8 inches in comparison to Samsung Galaxy S21 Plus 5G (8GB RAM + 256GB)'s 6.7 inch screen. There is Screen Type in both the phones. Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) has display density of 515 PPI & Samsung Galaxy S21 Plus 5G (8GB RAM + 256GB) has only 394 PPI display density. In terms of screen to body ratio, Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) has better screen to body ratio of ~ 89.8% than Samsung Galaxy S21 Plus 5G (8GB RAM + 256GB)'s ~ 88.3%. Samsung Galaxy S21 Plus 5G (8GB RAM + 256GB) has 20:9 aspect ratio where as Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) has 20:9 aspect ratio.
Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB)'s larger 12 GB RAM is better for playing games and all with respect to Samsung Galaxy S21 Plus 5G (8GB RAM + 256GB)'s lower 8 GB RAM. Samsung Galaxy S21 Plus 5G (8GB RAM + 256GB) has more Internal Memory (256 GB) than Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) (128 GB).
Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB)'s 108 MP Quad Rear Camera outshines Samsung Galaxy S21 Plus 5G (8GB RAM + 256GB)'s 64 MP + 12 MP + 12 MP Triple Rear Camera in terms of resolution. Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) will be better choice if you're looking to click lot of selfies as it has better 40 MP Front Camera in comparison to Samsung Galaxy S21 Plus 5G (8GB RAM + 256GB)'s 10 MP Front Camera.
Both the phones run on Android Operating System Version 10.
| Name | Samsung Galaxy S21 Plus 5G (8GB RAM + 256GB) | Samsung Galaxy S21 Ultra 5G (12GB RAM + 128GB) | 
| General | ||
| Model | Galaxy S21+ 5G | Galaxy S21 Ultra 5G | 
| Sim Type | Dual Sim, GSM+GSM | Dual Sim, GSM+GSM | 
| Dual Sim | Yes | Yes | 
| Sim Size | Nano+Nano SIM | Nano+Nano SIM | 
| Device Type | Smartphone | Smartphone | 
| Release Date | January 14, 2021 | January 14, 2021 | 
| Design | ||
| Dimensions | 75.6 x 161.5 x 7.8 mm | 75.6 x 165.1 x 8.9 mm | 
| Weight | 200 g | 227 g | 
| Display | ||
| Type | Color Dynamic AMOLED 2X (16M Colors) | Color Dynamic AMOLED 2X (16M Colors) | 
| Touch | Yes | Yes | 
| Size | 6.7 inches, 1080 x 2400 pixels, 120 Hz | 6.8 inches, 1440 x 3200 pixels, 120 Hz | 
| Aspect Ratio | 20:9 | 20:9 | 
| PPI | ~ 394 PPI | ~ 515 PPI | 
| Screen to Body Ratio | ~ 88.3% | ~ 89.8% | 
| Glass Type | Corning Gorilla Glass Victus | Corning Gorilla Glass Victus | 
| Features | Always-on Display, HDR10+ | Always-on Display, HDR10+ | 
| Notch | Yes, Punch Hole | Yes, Punch Hole | 
| Memory | ||
| RAM | 8 GB | 12 GB | 
| Storage | 256 GB | 128 GB | 
| Storage Type | UFS 3.1 | UFS 3.1 | 
| Connectivity | ||
| GPRS | Yes | Yes | 
| EDGE | Yes | Yes | 
| 3G | Yes | Yes | 
| 4G | Yes | Yes | 
| 5G | Yes | Yes | 
| VoLTE | Yes, Dual Stand-By | Yes, Dual Stand-By | 
| Wifi | Yes, with wifi-hotspot | Yes, with wifi-hotspot | 
| Bluetooth | Yes, v5.0, A2DP, LE | Yes, v5.2, A2DP, LE | 
| USB | Yes, USB-C v3.2 | Yes, USB-C v3.2 | 
| USB Features | USB on-the-go, USB Charging | USB on-the-go, USB Charging | 
| Extra | ||
| GPS | Yes, with A-GPS, GLONASS, BDS, GALILEO | Yes, with A-GPS, GLONASS, BDS, GALILEO | 
| Fingerprint Sensor | Yes, In Display | Yes, In Display | 
| Face Unlock | Yes | Yes | 
| Sensors | Accelerometer, Gyro, Proximity, Compass, Barometer | Accelerometer, Gyro, Proximity, Compass, Barometer | 
| 3.5mm Headphone Jack | No | No | 
| NFC | Yes | Yes | 
| Water Resistance | Yes, 1.5 m upto 30 min | Yes, 1.5 m upto 30 min | 
| IP Rating | IP68 | IP68 | 
| Dust Resistant | Yes | Yes | 
| Camera | ||
| Rear Camera | 12 MP ƒ/1.8 (Wide Angle) 64 MP ƒ/2 (Telephoto) 12 MP ƒ/2.2 (Ultra Wide) | 108 MP ƒ/1.8 10 MP ƒ/4.9 (Telephoto) 10 MP ƒ/2.4 (Telephoto) 12 MP ƒ/2.2 (Ultra Wide) | 
| OIS | Yes | Yes | 
| Auto Focus | Yes | Yes | 
| Features | Auto-HDR, Panorama | Auto-HDR, Panorama | 
| Video Recording | 8K @ 24 fps UHD, 4K @ 30/60 fps UHD, 1080p @ 240/30/60 fps FHD, 720p @ 960 fps HD | 8K @ 24 fps UHD, 4K @ 30/60 fps UHD, 1080p @ 240/30/60 fps FHD, 720p @ 960 fps HD | 
| Flash | Yes, LED | Yes, LED | 
| Front Camera | 10 MP ƒ/2.2 (Wide Angle) Punch Hole, Autofocus | 40 MP ƒ/2.2 (Wide Angle) Punch Hole, Autofocus | 
| Front Video Recording | 4K @ 30/60 fps UHD, 1080p @ 30 fps FHD | 4K @ 30/60 fps UHD, 1080p @ 30 fps FHD | 
| Technical | ||
| OS | Android v10 | Android v10 | 
| Chipset | Samsung Exynos 2100 | Samsung Exynos 2100 | 
| CPU | 2.9 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 | 1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55 | 
| GPU | Mali-G78 MP14 | Mali-G78 MP14 | 
| Java | No | No | 
| Browser | Yes | Yes | 
| Multimedia | ||
| Yes | Yes | |
| Music | Yes | Yes | 
| Video | Yes | Yes | 
| FM Radio | No | No | 
| Document Reader | Yes | Yes | 
| Battery | ||
| Type | Non-Removable Battery | Non-Removable Battery | 
| Size | 4800 mAh, Li-Po Battery | 5000 mAh, Li-Po Battery | 
| Fast Charging | Yes, 25W Fast Charging | Yes, 25W Fast Charging | 
| Wireless Charging | Yes, 15W | Yes, 15W | 
| Reverse Charging | Yes, 4.5W | Yes, 4.5W |