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Xiaomi Mi 8 Pro vs. OnePlus 6T: Which should you buy?

OnePlus 6T
OnePlus 6T (Image credit: Android Central)

OnePlus 6T

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OnePlus's latest flagship is the culmination of years of progress for the nascent brand. It's as fast or faster than most $1000 flagships, boasts as much RAM and storage as you could ever want, and has the nicest software outside of Google's Pixel series. The biggest thing you miss out on is an excellent camera, but even there the 6T punches above its weight.

OnePlus 6T

Pure speed

Phenomenal performance
Long battery life
Latest Android software
Clean, fast OxygenOS
No headphone jack
Bad haptics
Less-than-perfect in-screen fingerprint

Xiaomi Mi 8 Pro

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Xiaomi's first flagship entry into the UK market is a great-looking phone that's also excellent value for money, particularly if photo quality is important. But its MIUI software, currently based on Android Oreo, may be offputting. And the mere 3,000mAh cell means multi-day battery life is out of the question for all but the lightest of users.

Xiaomi Mi 8 Pro

A challenger approaches

Compact design
Great camera
Sharp design with aesthetic flair
Dedicated telephoto lens
Ships on Oreo
Small battery
Xiaomi historically slower with updates

Here are two phones with identical starting prices and very different priorities. The 6T embodies OnePlus's transformation from a niche enthusiast brand into a mainstream hit, while the Xiaomi Mi 8 Pro is more of a traditional flagship phone, with a smaller size and greater emphasis on things like camera hardware.

What's the difference between the OnePlus 6T and Xiaomi Mi 8 Pro?

The most noticeable difference between these two phones is their size. An extra 0.2 inches on the diagonal makes the Xiaomi Mi 8 Pro more one-handable than the OnePlus 6T. (Though for some, the 6T's expansive display may be a reason to buy.) The Mi 8 Pro's smaller size means it has a significantly lower battery capacity than than the 6T, though at least it's kitted out with the latest Qualcomm Quick Charge 4 for speedy refills. The shape of the Mi 8 Pro is more iPhone-like than many Android phones, with softly rounded corners and sides, and even a camera module styled after Apple's latest handsets. Size aside, the display quality of both phones is impressive, with ample daylight visibility and vivid colors. The 6T pushes the limits of reasonable pixel density at Full HD; nevertheless, these are both great displays.

The core specs are evenly matched outside of a couple of areas. Both are Snapdragon 845 handsets with RAM starting at 6GB and storage at 128GB. Both offer in-screen fingerprint solutions that aren't great, but are just about acceptable. Both have bottom-firing speakers and lack removable storage, 3.5mm headphone jacks and any kind of official IP rating. Both support two of the quickest quick-charging implementations around: the standard formerly known as Dash Charge on the 6T, and Qualcomm's Quick Charge 4+ on the Mi 8 Pro.

Yet the battery capacities here are miles apart. The OnePlus 6T is one of the best-performing Android phones of the moment for battery life, with a healthy 3,700mAh power pack, while the Mi 8 Pro is at best average with its 3,000mAh cell.

CategoryOnePlus 6TXiaomi Mi 8 Pro
Operating systemAndroid 9 PieAndroid 8.1 Oreo
Display6.41-inch AMOLED, 2340x1080
Gorilla Glass 6
6.21-inch AMOLED, 1080 x 2248
Gorilla Glass 5
ProcessorQualcomm Snapdragon 845Qualcomm Snapdragon 845
RAM6/8/10GB6/8GB
Storage128/256GB128GB
ExpandableNoNo
Rear camera 116MP (IMX 519), 1.22-micron, f/1.7, OIS
4K/60, 1080p/240, 720p/480 video
12 MP, 1.4-micron, f/1.8, 4-axis OIS, dual pixel PDAF
Rear camera 220MP (IMX 376K), 1-micron, f/1.712 MP, 1-micron, f/2.4, AF, 2x optical zoom
Front camera16MP (IMX 371), 1-micron, f/2.08MP, f/1.7, auto focus
ConnectivityWi-Fi 802.11ac 2x2 MIMO, Bluetooth 5.0 LE, NFC, GPSWi-Fi 802.11ac 2x2 MIMO, Bluetooth 5.0 LE, NFC, GPS
AudioBottom-firing speaker
USB-C
Bottom-firing speaker
USB-C
Battery3700mAh
Non-removable
3000mAh
Non-removable
Charging20W Fast Charge (formerly Dash Charge)Qualcomm Quick Charge 4+
Water resistanceNo IP ratingNo IP rating
SecurityIn-screen fingerprint + Face unlockIn-screen fingerprint + face unlock
Dimensions157.5 x 74.8 x 8.2 mm
185 g
154.9 x 74.8 x 7.6 mm
177 g
ColorsMidnight Black, Mirror Black, Thunder Purple, Speed OrangeBlack (transparent), Meteorite black, Twilight Gold

The most tangible differences though, outside of the physical size of these devices, have to do the software experience and camera quality on offer.

OnePlus's OxygenOS is one of our favorite Android experiences thanks to its clean near-stock Android look and lightning-fast performance. OnePlus's vision of Android doesn't stray far from Google's, yet in many cases, the company seems to do a better job optimizing the software even than Android's creators. The current OxygenOS 9 that ships on the OnePlus 6T is also based on the latest iteration of Android, version 9 Pie, and the firm has an excellent track record for fast software updates. What's more, OxygenOS offers a ton of customization options, including reprogrammable buttons, gesture controls and an excellent always-on display feature. If you like to tweak and tinker, you'll find plenty to play with here.

Xiaomi's MIUI is highly differentiated, and doesn't really look like any other Android skin. It has its own angular look, with pastel colors, flat menus and icons, and pleasing animations. It's also fairly feature-rich, with Xiaomi's own creations like the Mi Drop file transfer app building on . However right now the Mi 8 Pro's software is based on Android 8.1 Oreo, so you'll need to wait for a slice of Android Pie. What's more, Xiaomi's track record with fast software updates is less than stellar.

Nicer software from the 6T versus better pics from the Mi 8 Pro.

OnePlus has historically relied on software processing to pull ahead in the photographic arena, and the 6T puts in a decent performance with its 16-megapixel, optically stabilized main camera. (The second lens is for depth sensing in portrait shots and nothing else.) Most recently, OnePlus added a dedicated night mode for clearer low-light captures, further nipping at the heels of expensive flagships. But the Mi 8 Pro has an undeniable hardware advantage, with a superior 12-megapixel sensor with larger pixels, allowing for better low-light captures and higher dynamic range without leaning on software magic.

What's more, the Mi 8 Pro has a dedicated secondary telephoto camera, a feature missing from the 6T. OnePlus continues to rely on digital zoom, and the difference is plain to see. Despite some great software from OnePlus, Xiaomi has the advantage here.

Overall, this pairing is stacked in OnePlus's favor. It has the more capable phone overall, mainly thanks to a bigger battery, better software and truly exceptional performance. But if you want the best camera at this price, the Mi 8 Pro is equally worthy of consideration — assuming you can live with the software and battery life trade-offs.

Alex Dobie
Alex Dobie

Alex was with Android Central for over a decade, producing written and video content for the site, and served as global Executive Editor from 2016 to 2022.