I installed cachyOS on my gaming laptop mid last year, and I’ve been really happy with it. Very few issues I couldn’t easily troubleshoot myself.

Not that it’s a relevant comparison, but I installed bazzite on my handheld, and had enough problems with it that I installed cachy instead.

I’ve seen plenty of people happy with either, so I guess it’s mostly personal preference re: arch vs fedora, immutable distros, etc etc

To be fair, they are looking at distro numbers on ProtonDB. It’s not surprising that a distro made for and aimed at gamers is going to be popular in that context.