Toribash
I personally think that the OS is better all around. It's much more visually appealing, Safari is better than IE any day of the week, there's an App Store specifically for Macs now, which comes with the computer, which has apps like Final Cut Pro, AutoCad, and other not-so-expensive things like a bank account manager, Twitter and FB clients, etc. Plus Finder is much better than having to browse through "My Computer" or "My Files" or the dreaded "search" bar on Windows *shudder*. There's a search function on Mac, but at least on Mac it works.