On desktop: Linux since late 1996. It is the only operating system that I can perfectly tune to adhere to my - often weird - ideas, and can run all the software I need. I'm a developer, mostly working on free and open source software, so Linux is right there to assist me with that. When I play games, I play them through Wine/Proton, have been since I started gaming on Linux some two decades ago. If a game does not work under Wine/Proton, that's simply not a game I will be playing.

For portable gaming, I have a Steam Deck. Surprisingly, that also runs Linux.

My phone is running stock Android, and I hate it, because the way I function, and how Android imagines I would are not compatible, and the system does not let me bend it to my will, there isn't enough flexibility built in. Like... I can't uninstall a bunch of applications I'm never going to use, because my phone came preinstalled with it, and they're not removable, unless I jailbreak it. Unfortunately, I can't jailbreak it, because then my bank's application would stop working. Which would be fine, since I don't do banking on the phone. Except the application is required for mandatory 2FA. FML.

Thankfully, I can go days without touching my phone, so I can live with it being a piece of crap.

(The rest of my family is also on Linux: both parents, wife, and eventually the kids too.)