

If they like how SteamOS worked, then go with Bazzite. I’ve used Linux for nearly 3 decades now. At the end of the day, we could nickle and dime the differences and the pros and cons. I don’t think it’s worth it. Bazzite will be familiar enough, and you can add Bottles to handle other game launchers. That will give you the most kitchen appliance like device.
Just pick something. They are all free (nearly all of them), so you can always install something else pretty easily. Spend some time to get your feet wet and get the lay of the land. After a week or two, you’ll probably have a really good direction on what you actually want. You can also run them as live oses, so download a few with different Desktop Environments you think are interesting and test them out. Then install one.