Xiaomi Mi 9 vs OnePlus 6T: Which is best?

Design: Two of a kind

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These are both sleek-looking handsets. In fact, they’re nearly identical from the front. Both have teardrop notches atop the screen, with the 6T’s sloped and the Mi 9’s a bit more severe. Both have a smidge of bezel at the top and a slightly larger chin at the bottom, but it’s the screen that dominates both faces.

On the back, the Xiaomi Mi 9 opts for a glossy finish while the OnePlus 6T frosts its own glass – and the cameras are center-mounted on the 6T, but on the left on the Mi 9. Overall, however, they’re pretty close in overall design and execution.

Verdict: Draw

Screen: Nearly identical

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Again, the specs are very close here. The OnePlus 6T has a 6.41in 1080p AMOLED panel, while the Xiaomi Mi 9 opts for… a 6.39in 1080p AMOLED panel. Will you notice the .02in difference in size? No, we don’t think so.

We know the OnePlus 6T screen looks great, with superb contrast and solid sharpness – albeit not at the level of a Galaxy S10 or iPhone XS screen. And indeed, the Mi 9’s screen looks just as strong.

Both also have an in-display fingerprint sensor – a higher-end flagship perk that’s gradually reaching cheaper handsets.

Verdict: Draw

Camera: Mi’s lead

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Here’s where Xiaomi comes ahead. The OnePlus 6T has a very good dual-camera setup with a 16-megapixel main sensor and 20MP secondary one alongside. It comes up short compared to other top snappers like the Huawei Mate 20 Pro and Google Pixel 3 XL, but still delivers strong shots in good lighting and is great for the money.

Xiaomi’s Mi 9, as a flagship phone in 2019, opts for three back cameras instead. Quantity isn’t everything, of course, but there’s very good hardware within. The Mi 9 has a 48MP Sony IMX586 1/2" sensor flanked by a 16MP ultra-wide camera and 12MP telephoto camera. Artificial intelligence uses all three sensors together to put together a stellar shot.

Camera experts DxOMark have already raved about the Mi 9’s camera setup, giving it a score of 107 – just one point below the twice-as-expense Samsung Galaxy S10. That’s impressive. And in our testing, the main sensor captures quite a bit of detail. The other sensors aren’t as powerful, but they’re solid indeed. Overall, we think it has a decent edge against the OnePlus 6T.

Verdict: Xiaomi Mi 9

Performance: A year ahead

The OnePlus 6T uses last year’s leading Android chip, the Qualcomm Snapdragon 845 – but some months have passed since its release, and now the Mi 9 has the benefit of using this year’s chip, the Snapdragon 855.

It delivers more speed in both single-core and multi-core applications, and while the difference isn’t obvious in everyday use, you have more power to play with on the Mi 9. Both handsets offer 6GB RAM in the base model, while the OnePlus 6T ranges up to 10GB and the Xiaomi Mi 9 can hit a peak of 12GB.

Verdict: Xiaomi Mi 9

Battery and perks: The OnePlus edge

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OnePlus has an advantage here, as its 3,700mAh battery pack is more than 10% larger than the 3,300mAh pack in the Xiaomi Mi 9. The OnePlus 6T is a strong all-day phone that can take a solid beating from games and streaming media, but the Mi 9 is a bit less resistant. On the plus side, the Mi 9 offers wireless charging.

The OnePlus 6T also leads with starting storage, at 128GB with a 256GB model available. The Mi 9 just starts with 64GB, but it also ranges up to 256GB. Neither phone allows microSD cards for expandable storage, which is disappointing.

Looking elsewhere around the phone, we greatly prefer OnePlus’ Android skin over what Xiaomi’s using, plus the Mi 9’s speaker underwhelms.

Verdict: OnePlus 6T

Verdict: Tough to choose

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As seen in the showdown above, the Xiaomi Mi 9 has a couple of notable advantages here: its triple-camera setup has a stronger main sensor than the OnePlus 6T, and the Mi 9’s newer processor packs more of a punch. On the other hand, the OnePlus 6T has better battery life, more starting storage, and a better Android skin.

Ultimately, these phones are pretty close, and both are recommended if you’re looking for a flagship-quality handset at a much lower price than the Samsungs and Googles of the world. We’d argue that the OnePlus 6T provides the slightly better overall experience, even with the Mi 9’s hardware perks, but we don’t have official UK pricing for the Mi 9 just yet. If it undercuts the OnePLus 6T by any reasonable margin, then it could come out ahead here. Stay tuned for our finalised verdict soon.