As I know have been using my Mac off and on for about a 9 months while still living in a Windows world most of the time I can say that the thing that annoys me the most is the lack of toolbars on the applications I find myself getting irritated that the menus are not on the applications top bar. It really is annoying call it a personal pet peeve. Now it appears Windows may be trying to clean up the menu bar and I almost shouted no at the desktop. But if this trend continues and as each vendor copies each others ideas we will continue to see the operating systems converge.
Up to this point the only thing that I can honestly say that OSX does better than windows is their install process. When I remove installed applications I know they are gone. Windows has gotten better over the years but I still find too many applications leaving files and entries behind. Other than that productivity and ease of use is equal. I have yet to run an application on my Mac that was any better or worse than any I have running on my Windows box.
Oh the Apple is definitely more pretty but hey its a computer not a fashion statement. [PCWorld]