I haven’t tried VR in Linux
Valve Index, SteamVR, install, setup, play, no tinkering.
Now… if one does want to buy hardware from Meta (… which sadly I understand, it’s so damn cheap) and Meta refuses to support Linux, well, it’s kind of a decision on the buyer. Still, if one still want to tinker, because they have the hardware now, plenty of good solutions listed on https://lvra.gitlab.io e.g. ALVR (very convenient nowadays) or WiVRn and more.
That’s entirely use case specific. CUDA is actually used more on Linux than on Windows (I don’t have data, but even Azure by Microsoft runs on Linux…) so for e.g. NVIDIA hardware for professionals the support is better there.