Like 10-15 years ago I was into linux and tried a bunch of different distros (PCLinuxOS, Mint, CentOS, OpenSuse...) and was quite happy with the, then, limited options of gaming on linux (It was the time Valve released TF2 for linux)
But time passed, I got a new PC and didn't bothered install any linux distro (because I got a small HDD and didn't wanted to split it in partitions for linux)
Back then stuff like Proton did not even exists, so today I'm kind of lost and don't know what flavour I should pick, so here I am asking for advice
A couple of relevant details about the hardware, my PC is a little bit old (i7-7700) I hope that's not an obstacle to enjoy gaming on linux I also have an Nvidia graphic card
Also, while most people just use Steam I also use GOG regularly, if that matters
I don't know how others feel about it here, but I've recently returned to Linux as well and picked Pop!_OS for my gaming PC. The main draw was that you can download a spin with the Nvidia drivers preinstalled, so you can get up and running without any faff. It's also just really nice to use in general.
The caveat to all that is that the Nvidia drivers in the distro's repo are currently a little out of date, although a more up to date release is apparently due "soon" and should be completely tested for compatibility.
I just swapped over to Pop!_OS and its been amazing. Diablo 4 runs better on pop than windows.