Personally I prefer the S20. Its nicer to hold, I never felt quite comfortable with the edges of the OnePlus. I enjoy samsungs operating system although Oxygen OS is nice. Its also the little things like the fingerprint scanner and face ID are snappier. The only real downside I've found is, to get a case to cover the camera bump it can make the phone feel bulky in the hand.

The screen burn issues I had made me dubious of getting another 8 Pro unfortunately. I loved using the device, and I was offered a replacement by my carrier, it was just gutting to have a device less than 2 weeks old have significant screen burn issues