When I joined my last company, it would have been politically unpalatable to run Windows which was what I was used to, Linux was sort of frustrating to me at the time (even if I'm sure I could have adapted and it has improved in the last 15 years), and then there were Macs--which I had never used but turned out to be very straightforward.

And I've been mostly in the Mac camp ever since even if I'll use other OSs as needed.