MacOS. Works well for me from a usability standpoint. I work in software, and using iTerm2 with Zsh and a bunch of custom configuration increases my velocity for actual work and things I explore and learn on the side.

I think the UI is very elegant, and some of the software is fantastic. I use Omnigraffle and Omniflow for design work and tracking my agenda items. No complaints whatsoever.

I hook up an external monitor, and maybe the OS isn’t completely responsible for this, but I get buttery smooth 144hz. It’s joyful to work with.

Everything just works. I don’t have to solve 10 other problems to solve the problem I actually want to solve.