Which version is best? "It depends".
I would choose one of the bigger distributions because: 1. Valve/Distro devs care about that Steam works. 2. Any problems are easy to search for (big community) 3. Patches arrive in a timely manner.
For me that would be one of Ubuntu, Manjaro or Fedora, depending on whether you prefer Debian based, Arch based or Red Hat based.
Personally I've been running Steam on Ubuntu with no issues since 2017.
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