[SpecMode]

Hmm...well, the big difference between Mac OS X and Windows (XP, 2000, et al) is that OS X was rewritten from the ground up, sacrificing compatibility with many older applications for speed and stability, while Microsoft decided to maximize compatibility with the majority of older Windows applications in newer versions of its OS.

The end result is 'code bloat': excesses of obsolete code that are kept around to ensure that the newest versions of Windows are still able to run applications created over a decade ago. This is seen by many developers (not just Mac users) as unwieldy and IMHO is one of the biggest reasons that Windows seems to be more 'buggy' than most other OSes these days.