I can say that I’m fairly comfortable using both Apple’s OSX (currently Snow Leopard) and Microsoft’s Windows (currently Vista). Each one has it’s own strengths and weaknesses.
Ease of Use - I’d give this one to Windows. Majority of computer users are familiar with the user interface, and the upcoming (just released) Windows 7 is said to offer some good refinements. But it’s not saying that OSX is hard to use. It’s just like using an iPhone after you’ve been through year with Nokia.
Stability - This one goes to the Mac. it just simply works. But it’s not as clear cut because most of the instability of windows is due to 3rd party software and poor quality hardware which is also from 3rd parties. Quality control is easier on the Mac side since they make the OS and the hardware.
Customization - hardware and software there are just a lot more options for Windows and its machines. I could argue that Mac, with its beautiful interface doesn’t need customization but I could say the same thing about Windows 7. It’s just that if you want to do more or design your own, you have more choices in the Window’s world for both the hardware and software.
Compatibility - this one is a tie. Major software like Microsoft Office, Photoshop, Net browsers are available for both Mac and Windows. Although gadgets like celphones (Nokia, SonyEricsson, Samsung, Blackberries, GPS devices, audio equipment may be delayed in coming up with Mac compatible software there’s always Bootcamp.
Price - a tie. you get what you pay for. Mac’s are really more expensive if you look at the hardware specifications which is hard not to do when Apple started using Intel processors in their machines. But from experience even if you have the same specs on paper, the actual performance is a lot difference and most of the time in favor of Macs. Maybe it’s the architecture or maybe the fact that only one company designs both hardware and software while Windows has to deal with 3rd party vendors. And looking at design & quality - well just actually touch and feel the MacBook Pros and iMacs.
If you have any questions about the specifics, just place a comment or email me and I’ll try to give an answer. Windows Vista has been good to me and I don’t really see what the complaints are about. Hopefully I get to try Windows 7 soon and post my experience with it.