It depends on your needs really. I know exactly what I want so that's why chose op eventually.
I think op could be the speediest and minimal lag in android world. As mentioned, the biggest downfall is their camera imo. V v average cam lol. I don't expect op7t to perform miracle on their cam
Samseng I'm not fond of due to many reasons like inferior chipset, stupid curved screen, slow updates, bloatware, the lag etc... I only like the cam last time
Hw me not sure as haven't tried their phone before. But won't get that for now due to the issue they had with US months ago
Xiaomi is good for their price, only thing is their software not suit some ppl's palate. Actually their cam is pretty decent tbh, won't lose to op
Pixel is an overly expensive phone with low quality specs (trying v hard to blindly follow iphone in many ways) and after so many years still ugly design
I know some may not agree with me but let's agree to disagree Wahahhaha
Just wanna add that Motorola also minimal lag haha, just that it isn't selling anymore? V durable phone now 4-5yrs and still working