OSX is too simple for it's own good. You can't do jack with it, I wouldn't even call it that great for video editing. The only reason it is show praised is because it looks shiny (never liked it's look personally) and it's more stable than Windows (which is only because Apple computers work with it)
You can too do stuff with OS X, I do graphics, flash, and video work and it performs a lot better than Windows. Being more stable than Windows has NOTHING to do with what kind of computer it is on, I've installed MacOS X on several non-apple computers and it ran far more stable and faster than Windows XP did that on the computer. On OS X, I can do everything I can do on Windows except for Windows-Only games. OS X on my 1.1GHz laptop is faster than Windows on my 2GHz P4 and it does great with Adobe CS3 and Final Cut for an older system.