If you are a camera enthousiast you should go with the Samsung. Otherwise I would go with the OnePlus 9 because it's newer, it has a way more powerful chip and it doesn't have the ugly one UI, but the last one is an opinion. I know many people like one UI, but I know for sure most people find oxygen OS to be better (even after the oppo merge).

I must however say that I had the s20fe 5g for 5 days but I sent it back. It had some dealbreaking bugs. The first one I encountered is a widely known one which is touchscreen issues. Sometimes it would not register touches in certain areas where other areas would work. It disappears in a few minutes and I had the issues around 7 times a day I think.

Then there was another issue. The screen sometimes randomly went black. The only thing you could do to get the screen working was to connect it to a computer or outlet and then hold 2 buttons. Normal reset didn't even work. The phone was functioning because I received notifications, but the screen would show nothing, just black. This happened twice in my 5 days of having the phone.

Because of these reasons I sent it back. It isn't to say that the same would happen to you, but know these issues exist. I traded it in for a Xiaomi Poco f3 and got €200 back because it's cheaper. Had been a pleasure for more than half a year now.

I myself would go with the OnePlus 9. But if cameras are your thing. They are great on the Samsung!

S22+. Camera improvements is much more than in S22 Ultra from S21 Ultra.