To anyone who hasnt: do it! I did it a year ago and the only things you cant do are games with kernel level anticheat, but pretty much any of those games arent worth playing in my opinion anyways.
I tried with two different GPUs (Nvidia and AMD), and 6 different distros (including gaming specific ones), and my experience was garbage. Everything was super laggy, including steam itself.
Eventually I gave up and reinstalled windows.
And I'm not a windows fan boy. That install is the only non-linux system I run apart from my work PC (which I just use to remote into Linux).
BG3 was the most recent, but all games I tried had issues, even ones that are Linux verified. And I think it was from repo for the distros that weren't specifically for gaming.
BG3 runs fine for me on Nvidia 3090 using BazziteOS.
Did you use different distros that were actually from different code bases, or was it just 6 flavors of Debian? BazziteOS is based off Fedora. I've had issues only with Debian based distros (which technically includes Ubuntu btw)
I agree with the other guy, I've done 3 playthroughs of that game on openSUSE tumbleweed with a GTX 1080.
My experience is don't try and run most games linux native, run them through proton in steam. Far more consistently out of the box working. If you run into any trouble, ProtonDB will have the fix posted 90% of the time
I personally find games to be more glitchy on Wayland, so if you're picking a compositor and want stability I'd say go X11.
That said, if you want "just works" go Linux Mint. I set my partner up with it near december 2023 and it's been smooth sailing. And they don't touch the command line at all