I would switch to Linux in a heartbeat before going to Apple. Actually, even if all computers in the world except for Apples were to stop working, I would start a new career before switching to Apple.
Jeez, that's a little harsh. What about the fact that almost everything that runs on Linux also runs on OS X and that they're practically interchangeable? And what about Clang and other cool Apple things?
Also, you'll go broke targeting Linux. There's no market there.
Now, once Steam releases on Linux... I don't think there will be a huge stampede to Linux, but it could be a pretty monumental shift.