AMD GPUs are officially supported in the Linux kernel and Mesa. They pretty much just work out of the box with minimal setup on a fresh distro install.
NVidia GPUs often require out-of-tree proprietary drivers to work with full performance; these drivers are often a pain to install and update. Supposedly, things are getting less terrible now, but NVidia is still overall more likely to cause you pain than AMD.
Intel Arc dGPUs, like AMD, have decent native kernel and Mesa support from what I can tell, but tend to have worse performance than AMD. However, I hear they’re ridiculously good for video encoding!
ffmpeg can use several different AV1 codecs, with varying levels of performance.