I've used Linux for 20 years and developed one of the distributions, back in the day.. I have many Linux boxes in my house and at work, but I still keep a Windows 7 desktop around for games and X-Plane, because I know that's a platform that will always see all the add-ons and such made for it. Why choose one OS or another, when you can have both? Or all three if you really need a Mac for something? Even on the same hardware, you can dual/triple boot (ok, it's a bit tricky to get OSX to boot on non-apple hardware but I hear it can be done; I have never had a need to do so, however.)