Mac OS at previous job,
Windows 7 at current job,
Lubuntu w/ OpenBox at home.
I've used DOS/Windows since the late 80s, started using Mac OS in the late 90s, and have been tinkering with Linux since the early 2000s.
I prefer working on a Mac, but since they're outlawed at work and I can't afford one for personal use right now, I'm good with Linux (even with it's configuration frustrations).
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