There’s not a “best” distro for gaming, it very much depends on what games you play.
If you want to play latest releases, a rolling release is most probably the best option for you, I hear openSUSE Tumbleweed is very good if you don’t like Arch.
If you want less “aggressive” updates but not exactly a stable, you can try Solus, it’s a sort of middle-ground between the 2.
If your games are not the latest ones, a Debian-based distro is a good option, rock-solid, updated enough and without any “extra fluff”.
I personally use Linux MX XFCE and I’m very happy about it.