What OS is better for gaming?

Hmm it is quite difficult to answer that question nowadays, Linux is really pushing through with Proton, DXVK and Wine lately, some games gain more fps in Linux than in Windows but gotta say Windows of course is going to have the full support first. Downside of Linux are games that uses third-party anti-cheats, they aren't fully supported yet and many games can't be played due to that as an example: The Crew 2 and Black Desert. Though they are working for compatibility so that's great. Use what you feel more comfortable with Windows and some Linux distros are great nowadays for gaming.