Few months ago I built a gaming PC and chose to not use Windows for multiple reasons. I would suggest sticking to AMD as it would better supported on Linux. For the OS I’m using Arch Linux which is base for a lot of gaming Linux distributions. 99% I have never felt like I was missing out by not using Windows. Wine/Proton works really well OOTB. I highly recommend it if you want to get into Linux gaming. Like others have mentioned, ProtonDB is also a great resource for finding game specific information.
Yes, you have a lot more options for Linux distributions which in my opinion is a pro and a con. Honestly I would suggest that you stick to one distribution probably the one that works with your hardware the best (most annoying to troubleshoot). All distributions are going to have some issues and you’ll need to prioritize what you need and stick to it. I’m saying this because I feel I wasted a lot of my time switching distributions rather than just working on trying to fix the issue or finding a workaround. Good luck and don’t forget Linux is beautiful <3