Stick with a Samsung. They have done me right. When they f**k up it has usually been due to my own fault. But, I reckon Oppo's can be fine little instruments of thecnology as well.
The cameras on most of these new little gizmozs are ususally brilliant IMO. I don't think I have paid more that 4000 k on the last 3 phones I have owned. Either way, I think you are in good shape.
Just know, for an absolute fact, that you will have some hiccups after you change things over. Just work through them until you get it right. But, a week or so later except there will be some kind of update issue that will fcuk your day up. It's just part of the game. A game that I don't care to play, but have to do it anyway. Do it sooner than later, you will be glad that you did.