I run Windows 10 for gaming, video editing/encoding and basic browsing on my desktop. My HTPC is also Windows so that my family doesn't have to fight with it too much.
Other than that, everything else is Linux. Both my personal and work laptops run Kubuntu (KDE <3), my servers are either Debian or Rocky Linux depending on the use case, OpenMediaVault for my NAS, and OpenBSD for my routing/firewalls.
I'm also looking to build a "small" CPU based render farm to off-load the video encoding from my desktop. Which will also be Linux, probably Debian because I'm lazy