Win 10.

Win 10 on my PC, Win11 on my work PC and SteamOS/Arch Linux on my Steam Deck.

Linux, specifically Debian.

(Also, not everyone here is a guy; I'm not.) I would recommend getting a computer with some reasonably mainstream Linux distribution, so that you can test your games on it. (Should be an x86 machine, so not a Raspberry Pi. A cheap mini PC may be enough if you're targeting lower spec machines.)

Linux - Pop_Os!

Interestingly Linux seems to be over-represented here on GOG compared to Steam. At least specifically amongst the active GOG forum posters, with a statistically impressive sample size N of 18.

I've been told on numerous occasions that "hey guys" is a completely appropriate and OK term to refer to an odd bunch of people?

I was also told to use "hey chaps" to refer to a boys/mens group. So take this all with a pinch of salt ;)

Obviously, you understand that OP was not soliciting only males or masculine identifying persons, but rather using guys as a generic term for people, or you would not have responded.

MSX BASIC 1.0, MS-DOS 6.22, Windows 3.11, Windows 95 OSR2, Windows 98 SE, Windows XP, Windows 8, Windows 10, Windows 11.

I never used Windows 7. I'll give it a shot someday though.

Debian mostly but I do have an old Windows 7 laptop (that rarely gets used).

Every woman I've ever met uses guys to refer to a group of people.

Linux BTW. With a KDE Plasma desktop.

Yes. Totally forgot to mention my Steam Deck!

GNU/Linux, Debian 12 RC release 4 x86_64.

Before this mostly debian, ubuntu or arch.

I do dual boot windows 10, originally just to play the witcher 3 when it came out and then after that windows only games though i'm currently moving completely away from windows / windows 10 after the announcement of its end of life in 2025 and fully plan to run linux from then on out.

Also planning to get off of steam at some point when I finish my backlog of games on there; though that's not really part of the operating system discussion.

Let us see here.
My modern Linux Manjaro Xfce desktop is borked, so is my Linux Mint Mate laptop so I am using my old desktop with Windows 7 Home Premium 64 bit, updated from Vista long ago. For some reason I cannot make a bootable USB stick on this antiquated pc so have been waiting for a certain someone to do it on their pc but they are always too busy or forgetting. I guess I will have to go visit someone soon whose trustworthy pc can be borrowed for 45 minutes so I can get the tool I need to fix my computers as it is driver issues, nothing physically broken.

Already back in 2008 I had no understanding why most people kept getting 32 bit Windows. Those who needed/wanted access to 16 bit programmes (or 16b installers for otherwise 32b programmes) being the exception.

Oh, my mobile? Android, whichever version (4? 5?).

Also, I plan on moving away from Xfce after having tested it thoroughly and seen some good and some, subjectively, bad about it.

Win 10 on desktop

Linux (on most of my x86/x64 machines), but more specifically Ubuntu Mate, which I have been using since it became an independent distro. But am slowly moving them all to PeppermintOS and installing the Mate desktop on that instead. As I am still using version 18.04, and will not update to the later versions, since they seemed to have made a pigs ear of the distro from what I have read.

Win 7 on one dual boot machine.

Win 8.1 on another dual boot machine.

Win 10 on another dual boot machine

Android (various versions) on many of my phones.

iOS on two old generation iPads.

Amiga OS 3.1 on the A1200.

Windows Phone 8.1 on one and 10 on two of my phones.

Symbian on a couple of my Nokia phones.

windows 10/11 on my desktop for games and video editing

and i have debian on my laptop, its almost unusable with windows bloat due to lower specs. It's only used for web browsing and checking email so I don't need any specific programs. I've used macbooks in the past and I plan to get a modern one soonish. I use iOS on my phone and iPad.

As I keep saying, if you don't have over 4 GB RAM, 64-bit just makes that limited memory be even more confining.
And heh, in 2008 I barely got the computer with 2 GB, the one I had at that point had 256 MB (initially 512 but a module failed in 2006 and never replaced it). This one with 4 GB (and no dedicated graphics) is from 2015.
Plus, at one point (admittedly way back), could just download and play Castle of the Winds on Win 7.