I don't understand why to use linux(Lack Adobe creative suite and many other softawares though could be run via Wine but with a performance glitch) and Windows(For developers ?? :P) when there is OSX is already doing a very good job.
Judging from your other comment, you have already picked OSX. If it works better for you thats all that matters, but its silly to pretend that you can't comprehend why other OSs exist. The answer is simple, not everyone likes the same thing.
Unfortunately, I didn't have enough for a rMBP, so I ended up spending a third of the cost of a 13" rMBP on a Thinkpad so I could run a dedicated Linux machine.
That being said, if someone just happens to prefer Linux, you really can't beat a Thinkpad from the T, X or W series'.