For gaming, Ubuntu's got the strongest support.
Why do I know that?
Because I tried running Steam on .. perhaps openSUSE or Void, & was told by Steam that they only support Ubuntu.
Since then I've read that they support others, but it was only a few years ago where they told me they only backed that one.
Linux Torvalds has spoken on how you simply can't make an app that will work on all distros: it isn't possible.
Gentoo would except for that kind of compatibility probably be your highest-performance OS, since you can intentionally include ALL of the CPU-optimizations which test to work best for you.
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