Desktop:

Windows. Got the thing a few years ago and didn't bother installing Linux since I was still new to it and didn't have the drive to learn enough about Linux to go through with it. Haven't done it now because I'm probably upgrading in less than a year and no point since I can just use it for experimenting with server stuff.

Laptop:

My last couple laptops have ended up with Linux on it. On my absolutely shitty pawnshop laptop I broke something in windows, making it so I couldn't do a lot of admin things since there was technically no admit account. Didn't feel like paying for a fresh installation on the shitty thing, so I instead switched it to Ubuntu, which I had in a thumb drive because I was trying to follow a guide telling me how to fix my windows issue, which didn't work at all.

My current store bought laptop runs a Debian fork that I wanted to try, MX. I quickly ran through the win11 setup process before removing that bloatware OS off it. Now I have things set up in a way that works just right for me, despite not being able to figure out why the headphone jack has a problem where it'll only play very staticy, very low volume sound at max volume depending on how loud the original audio is. I've given up on that, though, because I'm not smart enough to figure it out and have already switched to a wireless bluetooth set that works.