I have enough computers that I've lost count, but here's what I have off the top of my head:
My portable gaming PC, "Nugget": Windows 10
My main desktop: Fedora (33 I think) and Windows 10, dual-boot. 90% of the time is spent in Fedora.
Side-computer for when I'm working: Fedora 34
Laptop (Thinkpad T480): Fedora 33
Home server: AlmaLinux 8.3, which replaced CentOS 8 after Red Hat pulled the plug on it.
I'm currently on my Macbook Air right now, so... you know... macOS. I try to use the best tool for the job, which is almost always Linux for me. The Macbook is great for media consumption and portability. Linux is actually a pretty decent gaming platform these days, so I only reboot into Windows when I want to play something newer. I alternate between Cinnamon and KDE, if anyone was curious about the desktop environment. I might mess with FreeBSD (or one of the others) when I'm feeling less burned out.
I also recently tried Haiku, which was super intriguing. I'm really interested in seeing where that goes once hardware compatibility improves.