Ubuntu MATE on my gaming laptop and desktop, and Arch (Anarchy Linux installer) on my Thinkpad. I used to use Mint on my laptop until I fucked that up, and decided to make it the same OS as my desktop, but now I'm really wanting Arch back. Even though it's a little worse for gaming, since I almost entirely play FLOSS games now it doesn't matter at all, and in fact Arch is better there.

Used to use Arch under Antergos on my desktop for about 8 months until I decided that Debian Stable was cooler... And promptly ran Debian Testing for 6 months :P