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

Model OnePlus 7 Xiaomi Mi 9
OS version Android 9.0 Android 9.0
Builder interface OxygenOS MIUI
Screen size 6.41 inches 6.39 inches
Definition 2340 x 1080 pixels 2340 x 1080 pixels
Pixel density 402 dpi 403 dpi
Technology AMOLED Super Amoled
SoC Snapdragon 855 Snapdragon 855
Processor (CPU) ARMv8 ARMv8
Graphics Chip (GPU) Adreno 640 Adreno 640
RAM memory 6 GB, 8 GB 6 GB
Internal memory (flash) 128 GB, 256 GB 64 GB, 128 GB
MicroSD No No
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 MP 20 MP
Video recording 4K 4K
Wireless Wi-Fi 5 (ac) Wi-Fi 5 (ac)
Bluetooth 5.0 + A2DP + LE 5.0 + A2DP + LE
networks LTE, HSPA, GSM LTE, HSPA, GSM
Supported bands 2100 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)
NFC Yes Yes
Fingerprint sensor Yes Yes
Ports (Inputs / Outputs) USB Type-C USB Type-C
Geolocation Yes Yes
Drums 3700 mAh 3300 mAh
Dimensions 74.8 x 157.7 x 8.2mm 74.7 x 157.5 x 7.6mm
Weight 182 grams 173 grams
Colors Gray, Red Black, 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 7 Xiaomi Mi 9 OnePlus 6T Honor View 20
SoC S855 S855 S845 Kirin 980
AnTuTu 7.x 354,812 370,355 297 132 277,167
PCMark 2.0 9,669 8,838 8,641 7,836
3DMark Slingshot Extreme 5,439 5,499 4,738 3,665
3DMark Slingshot Extreme Graphics 6,053 6,355 5,257 3,737
3DMark Slingshot Extreme Physics 4,015 3,737 3,521 3,766
GFXBench Aztec Vulkan High 23/16 FPS 23/16 FPS NC NC
GFXBench Car Chase (onscreen / offscreen) 33/40 FPS 36/42 FPS 32/35 FPS 29/31 FPS
GFXBench Manhattan 3.0 (onscreen / offscreen) 59/89 FPS 60/101 FPS 59/83 FPS 59/43 FPS
Sequential read / write 1429/380 MB / s 796/189 MB / s 736/202 MB / s 852/252 MB / s
Random read / write 40.1k / 75.7k MB / s 37.1k / 37.1k IOPS 35.4k / 5.6k IOPS 43.6k / 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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