Arch.
I’m vegan, german and into fitness. There really was no other choice. /s?
Also, it’s lightweight, you always get the most recent software, pacman is superb and it’s super stable. In about 10 years on multiple systems, I never had anything break. The worst of it are simple problems during updates, which are always explained on their website.
Lastly, there is the wiki. The single best source of Linux information out there. Might as well be using the distro that’s directly explained there, albeit a lot of information can be used on other ones as well.
With arch-install, you don’t even need to learn much, but learning is never a bad idea and will be great if something does break. Every system can break. Arch prepares you for that.
Yes, there’s a main story event in the DLC with the single best piece of equipment - the Professor’s spectacles. Buy them, it’s your only chance!
Also there is some missable witcher gear in the very same quest, I think. Just get everything in the Borsodi Brothers’ venue.