First off, I have had a few different linux distro's over the years but I hardly know whats going on. Had a headless server, where again, I barely got it up and running.
Right now all but my main PC are running mint and I'm almost there on biting the bullet on moving my main to mint but I'm just not sure if it'll run everything, along with triple monitor setup. I was thinking of temple OS, but mint would probably be my choice.
A little tip for running steam games: Proton is all that's required to run most steam games that aren't linux native, but adding "gamemoderun %command%" to launch options can make games run better/at all so definitely make sure you've got that set up properly (I think Mint ships with it)
I've been gaming on Linux Mint for the last....four years? I think? It's been smooth sailing for most of that time. Steam/Proton changed everything and I would say that I'm able to play 95% of the games that I want to.
I ran mint for a long time on my main rig. It's solid and will do most everything you need to. My machine is similar in spec to yours so you shouldn't have any issues.
I only recently switched to OpenSUSE Tumbleweed as i wanted to try something more bleeding edge but boy do I miss Cinnamon.
I just set up Tmbleweed on my desktop the other month after using a Mint laptop for a few years. The first thing I did after getting it running was to replace dolphin and konsole with Nemo and gnome-terminal, explicitly because it felt more like home.
Mint is what i run on my main, as it's excellent as a daily driver. Been doing that for over 10 years now. On my other more specialized machines I run other distros more suited to the function.
Mint is pretty hassle free to set up for gaming, really. Once you have your GPU driver installed, just:
sudo apt-get update && sudo apt-get install steam
Manjaro is my current flavour of Linux, but been gaming on Linux for over the last 2 decades on a few dustros. The technology changed alot since then and Steam's proton was the massive game changer. though now I am in the process of moving away from steam but still use proton via other game launches. Trying out lutris currently.