Funny how OnePlus think they can play in the big boys league without good post services and a few 'insignificant' misses like IP certification, plastic frame, average camera and call quality, and so forth.
While I used to be a fan of their phones due to the good price quality ratio and the software, they got greedy and competition finally worked on their weaknesses - looking at Samsung now. Why pay for a Chinese made phone when you can buy a S series phone with proper, good servicing network and support available worldwide?

Updates of Xiaomi are solve 3 out of 5 problems, create another 2. They have  so many phones that it's easy to see why the support is so bad. Oneplus 9 is way too overpriced, at least 150 less would be the correct price.

oneplus better than xiaomi, specially in the camera department. very nice tones of colours to the photos indeed. the volume slider on the left hand side of the phone of the oneplus is also a plus, if you are left handed holding the phone. but both are a little oversized for the screen aspect ratio 20:9 value; rather keep it to 18.45:9