I picked Mac because that's my favorite OS for personal machines (I have a MacBook and a home built Hackintosh), but I use FreeBSD on my servers (absolutely love FreeBSD jails on production machines), and I'm using Ubuntu Linux on my mining rigs and on my home media center. I pretty much use a little bit of everything besides Windows 
If Windows could finally include a decent UNIX compatible command prompt/terminal I'd consider using it for some things, but right now that baby toy they call cmd.exe just doesn't cut it for me and I've tried Cygwin but that just wasn't the same.
If Windows could finally include a decent UNIX compatible command prompt/terminal I'd consider using it for some things, but right now that baby toy they call cmd.exe just doesn't cut it for me and I've tried Cygwin but that just wasn't the same.