Keegen

Honestly anything with a non LTS release schedule will be fine. So long as you keep a relatively recent kernel and GPU drivers it pretty much doesn’t matter. You can go for a rolling release like Arch or OpenSUSE Tumbleweed or a staged release like Fedora. Even Ubuntu or it’s derivatives are fine so long as you stick to the yearly versions and don’t have a particularly bleeding-edge hardware.
My only advice is stick to the popular stuff. This applies to both distros and desktop environments. Much easier to troubleshoot things and find help and they have more people using them, which usually means the experience is more polished and bugs get fixed faster.

You’re using an RDNA2 card so it’s possible your low FPS is caused by this issue. I would try this fix that was mentioned in the comments under that issue to see if your performance improves.

Glad to hear it! Enjoy your Linux journey!

I would try flashing an Ubuntu (or Kubuntu for KDE) or PopOS iso and booting that to try, they both include the proprietary Nvidia driver. This might be a Cinnamon issue or a Mint issue, trying a different distro helps you narrow down the possible cause.
This is probably a pretty unpopular opinion but I would never recommend anything but Gnome or KDE to a new Linux user. Those projects just have so much more development focus on them then all the smaller ones, it just makes sense to default to them for maximum ease of use and compatibility.

Using the open source driver with Nvidia is a bad idea, your card is locked at the minimum clock speed and it’s general quality is not comparable to the proprietary driver (this is purely because of Nvidia’s hostility to open source, not due to any inabilities of the developers of Nouvea.)
I’m gonna assume you are using the default desktop environment of Mint which is Cinnamon. Have you tried booting a different DE, or even better, a different distribution with something like Gnome or KDE to see if the issue persists?

For how great AMD usually is on Linux, it’s not without it’s issues. RDNA2 (the entire RX 6000 series) still suffers to this day from this 2 years old issue that can cause stutter in games as the GPU constantly downclocks itself aggressively. I still prefer it over Nvidia (having owned one and now using AMD) but just be aware, it’s not all as perfect as some Linux users would have you believe.

I keep going back and forth between KDE and Gnome. KDE is great on my desktop where I always have a mouse plugged in, but on my laptop I really like the workflow and gestures that Gnome on Wayland has.

Using LineageOS on my Moto G7 since I got it, no GApps at all. I plan to use it till the battery gives out and then get myself a latest Pixel and install GrapheneOS on it. De-googled Android is probably the best compromise of privacy/functionality you can get, Linux phones sadly are just not there in both hardware and software and I have no desire to trap myself in Apple’s walled garden prison.

Valve’s Proton never included the build-in FSR that GloriousEggroll’s Proton builds had. And it’s been gone since GE-Proton 8-1.

I always try the native version first if a game has one (old “native” ports using Wine don’t count) and only use Proton if it has serious problems. I want to see more Linux native games, and so I go out of my way to play them in their native version. There are some games that I own where the native version is clearly inferior to Proton, but for most it’s equal, or only slightly worse at best (I mean “Pillars of Eternity not having cloak physics in native version” level worse).