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Depends on the games. If your kid wants to play anything with kernel level anticheat, it will not work on Linux, period - these anticheats don't support Linux, and either prevent the game from running altogether or disable certain online modes.

Otherwise, CachyOS is extremely popular these days, and I suppose a valid choice.

Recommend making a live drive with Ventoy. Copy over latest .iso’s of Mint, Fedora, Bazzite? for gaming.

Give them all a test drive, see what you like before committing. After install try new things in VMs.

if theyre not that technical i would say just stick with something simple like zorinOS, which is ubuntu based so there is a bigger community behind it if they run into issues. zorin has an option to install nvidia drivers during the initial setup. popOS would be another option along the same lines