It used to be MacOS, but I jumped ship as soon as iOS stuff started creeping in years ago. Because I had already jumped ship from iPhones for the exact same stuff. Arch is my *nix of choice these days, or Linux Mint if I’m recommending it to someone else who doesn’t want to learn Arch.

But with that said, my daily driver is a Windows machine these days. I’m getting lazy as I get older, so (relatively) effortless compatibility is king.