I use Windows 10 LTSC 21H2. It's the most up-to-date LTSC version.
LTSC = Long Term Servicing Channel, which is a special verson of Windows Enterprise that doesn't receive feature updates, doesn't come with all the extra bloat (onedrive, store, xbox game bar, candycrush, office trials, etc).. It's meant for special support enterprise systems like MRI scanners, industrial use, etc..
The reason that I (legally, but for the wrong usecase) use it is that I don't want to switch to Windows 11 or be nagged about it, nor do I want all the extra bloat on top of my OS. But I do want to stay secure, and I get security updates without trouble.
I would rather run a Linux distribution, sadly I do play a few games that are still not working on Linux, even with Proton and lots ot manual trickery. And I play them for about 40 hours a week.