I do remember there was a site where you could check how well a game ran on linux

You probably remembering protondb.com. You can check how good your games run your games with proton (valve’s windows compatibel layer based on wine and dxvk). You can use proton with any games also outside of steam. For example with heroic launcher with epic and gog games.

At our repair cafe we only suggest Linux Mint. Sure if the person knows something about linux and want/needs a other distro we will help. But it helps us with support/writing manuals and for most people Linux Mint is fine.

I’m know my why around linux a bit, but for alot of other volunteers it also there first time touching Linux in anyway.

We don’t want to scare people away with 100+ options. Just simple, windows like and sane defaults.