My advice is to just look at the screenshots of a few mainstream ones and pick one that looks the most usable.

A few:

• Mint - Can’t go wrong if you like traditional desktop.
• Pop OS - Great for gaming (and many other things).
• Zorin - Never used it, but it’s supposedly easy, and very polished.
• Ubuntu - Has many haters (including myself), because of nuances, but honestly it’ll do the job just fine.