I’m on Debian Stable (with a few backported packages) for both work and gaming. It’s not the most beginner-friendly distro, but I’m no beginner, and I love how low-maintenance it is. It just keeps on working.
I would like to try Qubes OS eventually. I don’t think it will be ready for gaming any time soon, but for privacy and security-minded isolation of components, I expect it’s tough to beat.