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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Debian Sid should be fine. I wouldn't go with Stable − too old.
Personally, I'd go with the Flathub version of Steam and not pollute my main system with 32bit libraries Steam required for backwards compatibility. With the 32bit dependencies as Flatpak Runtimes, the main system stays clean.
You need an up to date systems to utilize newest packages of drivers (etc.) to make full use of recent hardware and to be able to play new games.
Linux Mint Debian Edition (LMDE 6) might also be a good fit for you.
I’m using Debian testing + a few packages from experimental (Mesa) and xanmod or liquorix kernel.
It’s been a great experience. Stable as expected, performant as anything else.
If Debian Stable supports your hardware, go for it. If not, try Debian Sid, but it won't be as stable. You can install up-to-date applications, like Steam, using flatpaks in any case.
Even if you opt for stable and there's an update that you may take advantage from, you can always update your kernel in several ways or change to Debian Sid (unstable), but you can't go back unless you change to Debian Testing and then wait the freeze of Testing which then becomes Debian Stable.
All I know is wine-mono and wine-gecko doesn't come in any default package lists on apt that you get on Linux Mint (which should include Debian and Ubuntu packages), not sure if they exist on some other mirror list somewhere but it didn't seem like it, while on Arch I got them directly from Extra (not even AUR).
Well you technically don't need mono or gecko, especially not if you're just going to use Steam Proton to play, but I use pure WINE a lot and it was a pain having to install them manually. Eventually I gave up on using mono and just downloaded the .net runtimes I needed through winetricks.
There were also some lib32 package I got from AUR on Arch that didn't exist on apt. One of those gst plugins (ugly/good/bad/nice/whatever)
At the end of the day, the distribution is not that important for gaming, unless you need those 1-2 extra fps. Debian is a very good choice for workstations nowadays. I was a long time OpenSUSE user, always had joys with Debian, but yesterday switched to Garuda Linux (Arch variant optimized for gaming) and I love it so far very much.
Don't opt for an LTS distro for gaming (or even for regular desktop use), opt of a rolling release one... or at least one that has 2 or 3 regular yearly releases.