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Steam data reveals PC gamers shifting from Windows to Linux
(www.tweaktown.com)
For PC gaming news and discussion. PCGamingWiki
Rules:
Like the others have said, all major distros are fine. Ubuntu is or used to be Valve's "favourite distro" and the package that you can get from Valve's website is for Ubuntu. That being said, software on Linux should be installed using the package manager (the Software Centre) and not downloaded from the Web.
You may wish to upgrade to Ubuntu 24.04 LTS later. This is fairly easy (you can use the Software Updater application) but the newer versions have better drivers and newer GNOME versions which may bring better performance.