I appreciate the video capability of the iPhone, and the options on the Samsungs, but if I had to choose, it would be the consistency and point-and-shoot nature of the Pixel.
I've used the S21 Ultra, Note 10 +, iPhone 12 Pro, 13 Pro Max, Pixel 3 and Pixel 6, so I think I have had a fair amount of exposure to all 3 to be able to make the comparison.
The thing is, the preference I have is based on my intense need to make all the cameras work. They just all take the same picture in wildly different ways. I guess that's good, except that we're talking about photography like it's art. It shouldn't be subjective, but each of the manufacturers have made it such. Maybe we win in the end because we get choice, but I'd imagine that with photography, there shouldn't be choice, since it's supposed to capture a 1 of 1 of the thing we're shooting. Variances should ideally be left to impressionist paintings and the likes, not our cameras.