I've used macs for years, but haven't actually owned one. As far as I could tell, their OS and hardware seemed to be less prone to freezing and crashing relative to their PC + Windows counterparts.
disclosure: i've been using/building/supporting PCs/networks for 18 years
Answer: No.
Both platforms are now fairly stable, assuming you don't build some piece of crap PC by yourself using dodgy components.
The nightmare of blue screens is long gone (pretty much since Windows 2000 if you were picky with hardware/driver support), this was mostly caused by dodgy third party hardware drivers and nowadays x64 windows requires Microsoft signed (and thus, tested) drivers.
The mac hardware is nicer, but this is more to do with aesthetics, the polish of the touchpad driver (i.e., multitouch works, it doesn't jump over the place, etc), the battery life, the case, glass screens, etc.
The selling points of the mac for me are the touchpad, the unix underpinnings and the case/battery life.
Windows these days (i.e., win7) is fine. It is let down by slapped together poorly finished "cheap" feeling hardware.
edit:
apple have never really faced the same problems windows did with drivers, because both hardware and most driver software was written by apple, who have a vested interest in making it work properly.
microsoft was at the mercy of third party hardware vendors rushing some crappy driver out the door that mostly worked, except when the PC slept, got under heavy CPU load, ran out of memory or some other "unusual" condition.
Not to say there never were problems in Windows, but the vast majority of the issues were always driver related...