I’ve had numerous gpus-I’ve been all over the map for years. Sometimes amd sucks, sometimes nvidia sucks. Right now, I’m rocking a 4090 and it’s working better in endeavoros than I’ve ever seen nvidia work in linux. (I’ve always had problems with nvidia cards screen tearing, stuttering, and general installation issues).
But honestly, those complaints have been resolved at least with my distro. I think both brands are in a good spot right now. I think you’re safe to buy whatever floats your boat.