Product
Vivo U3
Vivo U3
Xiaomi Redmi Y3
Xiaomi Redmi Y3
Battery
Charging 18W wired 5W reverse wired 10W wired
Type 5000 mAh, non-removable Li-Po 4000 mAh, non-removable
Body
Build Glass front, plastic back, plastic frame Glass front (Gorilla Glass 5), plastic back, plastic frame
Dimensions 162.2 x 76.5 x 8.9 mm (6.39 x 3.01 x 0.35 in) 158.7 x 75.6 x 8.5 mm (6.25 x 2.98 x 0.33 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Weight 193 g (6.81 oz) 180 g (6.35 oz)
  - Splash resistant
Comms
Bluetooth 5.0, A2DP, LE, aptX 4.2, A2DP, LE
Infrared port - Yes
NFC No No
Positioning GPS, GLONASS, GALILEO, BDS GPS, GLONASS, GALILEO
Radio FM radio FM radio
USB microUSB 2.0, OTG microUSB 2.0, OTG
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Display
Protection - Corning Gorilla Glass 5
Resolution 1080 x 2340 pixels, 19.5:9 ratio (~395 ppi density) 720 x 1520 pixels, 19:9 ratio (~269 ppi density)
Size 6.53 inches, 104.7 cm2 (~84.4% screen-to-body ratio) 6.26 inches, 97.8 cm2 (~81.5% screen-to-body ratio)
Type IPS LCD IPS LCD
Features
Sensors Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass
Launch
Announced 2019, October. Released 2019, October 2019, April. Released 2019, April
Status Discontinued Discontinued
Main Camera
Dual - 12 MP, f/2.2, 1/2.9", 1.25µm, PDAF 2 MP, (depth)
Features LED flash, HDR, panorama LED flash, panorama, HDR
Triple 16 MP, f/1.8, (wide), PDAF 8 MP, f/2.2, 13mm (ultrawide) 2 MP, f/2.4, (macro) -
Video 4K@30fps, 1080p@30fps 1080p@30/60fps, gyro-EIS
Memory
Card slot microSDXC (uses shared SIM slot) microSDXC (dedicated slot)
Internal 64GB 4GB RAM, 64GB 6GB RAM 32GB 3GB RAM, 64GB 4GB RAM
  UFS 2.1 eMMC 5.1
Misc
Colors Black, Blue, Green Elegant Blue, Bold Red, Prime Black
Models V1941A, V1941T M1810F6G, M1810F6I
SAR - 0.58 W/kg (head)     1.25 W/kg (body)    
Network
2G bands GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 1900 / 2100 HSDPA 850 / 900 / 1900 / 2100
4G bands 1, 3, 4, 5, 8, 34, 38, 39, 40, 41 1, 2, 3, 4, 5, 7, 8, 20, 28, 38, 40
Speed HSPA, LTE HSPA, LTE
Technology GSM / CDMA / HSPA / LTE GSM / HSPA / LTE
  CDMA 800 & TD-SCDMA 1, 3, 5, 8, 40, 41 - India
Our Tests
Performance - AnTuTu: 103259 (v7) GeekBench: 4292 (v4.4) GFXBench: 7.7fps (ES 3.1 onscreen)
Platform
Chipset Qualcomm SDM675 Snapdragon 675 (11 nm) Qualcomm SDM632 Snapdragon 632 (14 nm)
CPU Octa-core (2x2.0 GHz Kryo 460 Gold & 6x1.7 GHz Kryo 460 Silver) Octa-core (4x1.8 GHz Kryo 250 Gold & 4x1.8 GHz Kryo 250 Silver)
GPU Adreno 612 Adreno 506
OS Android 9.0 (Pie), Funtouch 9.0 Android 9.0 (Pie), planned upgrade to Android 10, MIUI 12
Selfie camera
Features HDR HDR
Single 16 MP, f/2.0, 26mm (wide), 1/3.06", 1.0µm 32 MP, f/2.2, 26mm (wide), 1/2.8", 0.8µm
Video 1080p@30fps 1080p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes