Kubuntu, because when I got my Vega 56 GPU on release day (August 14, 2017), I had to download the proprietary driver straight from AMD to get it working, and Ubuntu was the only distro supported by both it and Steam at the time. (Otherwise, I would’ve picked Debian or Mint.)
I don’t love Ubuntu (especially how they push Snap), but I can’t be bothered with the hassle of reinstalling my OS.
So basically, everybody switched from expensive UNIX™ to cheap “unix”-in-all-but-trademark-certification once it became feasible, and otherwise nothing has changed in 30 years.