Depending on how you use it, OS X can feel a lot like Linux. If you're spending most of your time in Terminal and Emacs, usually ssh'ed into a server, then your technical answer will diverge pretty far from your "real" or metaphysical answer.
I work for multiple clients. After messing a few years with "I need a postgres for this one, a mysql for this one and sometimes, things just break on the live server because Mac OS X is almost linuxlike", I switched to a fully virtualized development stack and haven't looked back since. So the answer is not metaphysical, but true.
