X11 is better for gaming, 100%. It isn’t because it’s either is inherently better for gaming or anything (although it is cuz vsync is always on on wayland), it’s just that most games can only run on X so if you run them on wayland you’d be running them through xwayland anyways and usually lose a bit of performance in the process (We’re generally talking marginal though, like 1-3fps difference or something)
I don’t think u should reallyy be too worried about which is better for gaming, the right question to ask is which is better for you.