No I am thinking of the situation where the open source driver doesn’t have opencl support and the AMD drivers (fglrx) doesn’t compile or requires dependencies

No I am thinking of the situation where the open source driver doesn’t have opencl support and the AMD drivers (fglrx) doesn’t compile or requires dependencies so old that it was dropped by the packagers for Arch Linux, all this for a few years until they come out with something that actually works when I’ve never ever had an issue with Nvidia. Also AMD never ever figured out how to fix screen tearing, or do so in a sane that doesn’t involve trial and error editing xorg.conf. Even on Windows AMD drivers are the most unstable, bugged software that’s even been shipped. It’s been a long standing joke that AMD “has no drivers”.