OnePlus 7 vs Xiaomi Mi 9: Which is the best Smartphone? – Comparison

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OnePlus 7 vs Xiaomi Mi 9

In the segment of affordable high-end smartphones, two names automatically come first, the Xiaomi Mi 9 and the OnePlus 7. For several years, these ranges have struggled to obtain the title of flagship killer. This year, the fight is very close. Using our detailed comparison, find out which of the two is the best smartphone.

If the ultra-premium is dominated by manufacturers like Apple, Samsung and Huawei, those who prefer smartphones more affordable but with few concessions can surely turn to OnePlus or Xiaomi. They will find smartphones that have long been called “flagship killers“, able to compete with the biggest names in many areas.

In 2019, the two smartphones that meet this definition are the OnePlus 7 and the Xiaomi Mi 9. But which one to choose?

What is the best smartphone between the OnePlus 7 and the Xiaomi Mi 9? Design, performance, photo, autonomy … Discover our detailed comparison between the two smartphones!

Comparative Data sheets: OnePlus 7 vs Xiaomi Mi 9

ModelOnePlus 7Xiaomi Mi 9
OS versionAndroid 9.0Android 9.0
Builder interfaceOxygenOSMIUI
Screen size6.41 inches6.39 inches
Definition2340 x 1080 pixels2340 x 1080 pixels
Pixel density402 dpi403 dpi
TechnologyAMOLEDSuper Amoled
SoCSnapdragon 855Snapdragon 855
Processor (CPU)ARMv8ARMv8
Graphics Chip (GPU)Adreno 640Adreno 640
RAM memory6 GB, 8 GB6 GB
Internal memory (flash)128 GB, 256 GB64 GB, 128 GB
MicroSDNoNo
Camera (backpack)Sensor 1: 48 MP
Sensor 2: 5 MP
Sensor 1: 48 MP
Sensor 2: 16 MP
Sensor 3: 12 MP
Camera (front)16 MP20 MP
Video recording4K4K
WirelessWi-Fi 5 (ac)Wi-Fi 5 (ac)
Bluetooth5.0 + A2DP + LE5.0 + A2DP + LE
networksLTE, HSPA, GSMLTE, HSPA, GSM
Supported bands2100 MHz (B1), 800 MHz (B20), 1800 MHz (B3), 2600 MHz (B7), 700 MHz (B28)2100 MHz (B1), 800 MHz (B20), 1800 MHz (B3), 2600 MHz (B7), 700 MHz (B28)
NFCYesYes
Fingerprint sensorYesYes
Ports (Inputs / Outputs)USB Type-CUSB Type-C
GeolocationYesYes
Drums3700 mAh3300 mAh
Dimensions74.8 x 157.7 x 8.2mm74.7 x 157.5 x 7.6mm
Weight182 grams173 grams
ColorsGray, RedBlack, Blue, Purple
Price$471.99$458.57

Performance: Snapdragon 855 at its best

OnePlus 7 and Xiaomi Mi 9 are equipped with the Snapdragon 855, the most powerful chip available at the moment, and 6 GB of RAM (even 8 GB for the most powerful version of OnePlus 7).

 OnePlus 7Xiaomi Mi 9OnePlus 6THonor View 20
SoCS855S855S845Kirin 980
AnTuTu 7.x354,812370,355297 132277,167
PCMark 2.09,6698,8388,6417,836
3DMark Slingshot Extreme5,4395,4994,7383,665
3DMark Slingshot Extreme Graphics6,0536,3555,2573,737
3DMark Slingshot Extreme Physics4,0153,7373,5213,766
GFXBench Aztec Vulkan High23/16 FPS23/16 FPSNCNC
GFXBench Car Chase (onscreen / offscreen)33/40 FPS36/42 FPS32/35 FPS29/31 FPS
GFXBench Manhattan 3.0 (onscreen / offscreen)59/89 FPS60/101 FPS59/83 FPS59/43 FPS
Sequential read / write1429/380 MB / s796/189 MB / s736/202 MB / s852/252 MB / s
Random read / write40.1k / 75.7k MB / s37.1k / 37.1k IOPS35.4k / 5.6k IOPS43.6k / 38.9k IOPS

In the benchmarks, the two smartphones are very close to each other, and it is the same in everyday life, whether on a standard use or greedy needs such as video games. On this point, OP7 and Mi 9 make no concessions.

Which is the best Smartphone?

OnePlus 7 and Xiaomi Mi 9 are excellent smartphones that offer a good general quality for a price of around 550 euros at their release. While the two cameras are almost identical in many respects, the Xiaomi Mi 9’s versatile camera and wireless charging compatibility finally give it a head start over its competitor, especially since it’s cheaper.

In this duel for the price-quality ratio of the “flagship killer” segment, it is therefore the Xiaomi Mi 9 that wins.

Price and availability

The Xiaomi Mi 9 is available from $408.49 at Amazon in its version 6 + 64 GB, or $458.57 in its version 6 + 128 GB.

The OnePlus 7 is available from $509.99 at Amazon.


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