Generally speaking amd is favored over nvidia on linux because it's driver lives in the kernel (more free), better wayland support (this is changing tho) and not having to install a driver manually or an installing a restricted driver from the package manager. I've been running my 6900xt for a couple of year and it's been great. The only downside of amd is if you need/want some of the nvidia tech like rtx and cuda. Here are some older benchmarks from when the 7900 xt was coming out https://www.phoronix.com/review/rx7900xt-rx7900xtx-linux
Generally speaking amd is favored over nvidia on linux because it's driver lives in the kernel (more free), better wayland support (this is changing tho) and not having to install a driver manually or an installing a restricted driver from the package manager. I've been running my 6900xt for a couple of year and it's been great. The only downside of amd is if you need/want some of the nvidia tech like rtx and cuda. Here are some older benchmarks from when the 7900 xt was coming out https://www.phoronix.com/review/rx7900xt-rx7900xtx-linux