Product
Vivo V9 6GB
Vivo V9 6GB
Xiaomi Mi Mix 2
Xiaomi Mi Mix 2
Battery
Charging - 18W wired, QC3
Type Li-Ion 3260 mAh, non-removable Li-Ion 3400 mAh, non-removable
Body
Build Glass front, plastic back, plastic frame Glass front (Gorilla Glass 4), ceramic back, aluminum frameGlass front (Gorilla Glass 4), ceramic back, ceramic frame - 128/8 GB model
Dimensions 154.8 x 75 x 7.9 mm (6.09 x 2.95 x 0.31 in) 151.8 x 75.5 x 7.7 mm (5.98 x 2.97 x 0.30 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Weight 150 g (5.29 oz) 185 g (6.53 oz)
Comms
Bluetooth 4.2, A2DP, LE 5.0, A2DP, LE
NFC No Yes
Positioning GPS, GLONASS, BDS GPS, GLONASS, BDS
Radio FM radio, recording No
USB microUSB 2.0, OTG USB Type-C
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Display
Protection - Corning Gorilla Glass 4
Resolution 1080 x 2280 pixels, 19:9 ratio (~400 ppi density) 1080 x 2160 pixels, 18:9 ratio (~403 ppi density)
Size 6.3 inches, 99.1 cm2 (~85.3% screen-to-body ratio) 5.99 inches, 92.6 cm2 (~80.8% screen-to-body ratio)
Type IPS LCD IPS LCD
Features
Sensors Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass Fingerprint (rear-mounted), accelerometer, gyro, compass, barometer
  - Virtual proximity sensing
Launch
Announced 2018, June. Released 2018, July 2017, September. Released 2017, September
Status Discontinued Discontinued
Main Camera
Dual 13 MP, f/2.2, PDAF 2 MP, (depth) -
Features Dual-LED flash, HDR, panorama Dual-LED dual-tone flash, HDR, panorama
Single - 12 MP, f/2.0, 1/2.9", 1.25µm, PDAF, 4-axis OIS
Video 4K@30fps, 1080p@30fps 4K@30fps, 1080p@30fps, 720p@120fps
Memory
Card slot microSDXC (dedicated slot) No
Internal 64GB 6GB RAM 64GB 6GB RAM, 128GB 6GB RAM, 128GB 8GB RAM, 256GB 6GB RAM
  eMMC 5.1 eMMC 5.1
Misc
Colors Black, Red Black, White
Models 1851 MDE5
SAR - 0.39 W/kg (head)     1.77 W/kg (body)    
Network
2G bands GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bands HSDPA 850 / 900 / 2100 HSDPA 800 / 850 / 900 / 1700(AWS) / 1800 / 1900 / 2100
4G bands 1, 3, 5, 8, 38, 40, 41 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 27, 28, 29, 30, 34, 38, 39, 40, 41
Speed HSPA 42.2/5.76 Mbps, LTE (3CA) Cat12 600/150 Mbps HSPA, LTE
Technology GSM / HSPA / LTE GSM / CDMA / HSPA / EVDO / LTE
  - CDMA2000 1xEV-DO
Our Tests
Battery (old) - Endurance rating 65h
Camera - Photo / Video
Display - Contrast ratio: 1287 (nominal), 3.19 (sunlight)
Loudspeaker - Voice 67dB / Noise 71dB / Ring 82dB
Performance - GeekBench: 6234 (v4.4) GFXBench: 24fps (ES 3.1 onscreen)
Platform
Chipset Qualcomm SDM660 Snapdragon 660 (14 nm) Qualcomm MSM8998 Snapdragon 835 (10 nm)
CPU Octa-core (4x2.2 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver) Octa-core (4x2.45 GHz Kryo & 4x1.9 GHz Kryo)
GPU Adreno 512 Adreno 540
OS Android 8.1 (Oreo), Funtouch 4 Android 7.1 (Nougat), planned upgrade to Android 10, MIUI 12
Selfie camera
Single 12 MP, f/2.0, (wide), 1/2.8", 1.28µm 5 MP, f/2.0
Video 1080p@30fps 1080p@30fps
Sound
3.5mm jack Yes No
Loudspeaker Yes Yes