With the advances in gaming on Linux in recent years, it is so tempting to switch full time. I would absolutely love to, but I am a Game Pass Ultimate subscriber and it is where I play a lot of my games on PC. I know you can use the cloud version, but I cannot stomach streaming games in their current state, so it is a no go. A large portion of my Steam library is compatible, but anytime I have done an install I end up giving in and going back to Windows for games.
I honestly don't think the distro matters too much if you just use steam. I use Arch and haven't had any issues with steam or proton that I can recall. SteamOS is itself Arch-based as well
I've been hopping between distros (and windows) for what feels like the past 6 months. Honestly it doesn't make too much of a difference but my preference for games is fedora or arch base and wayland.
The biggest difference is the default kernel version really (AMD drivers in my case) but you can also add a newer kernel to any distro. I'd recommend just choosing a distro based on the package manager you like to use and stick with that.