Hardware aside, the real reason you should switch is OSX and the applications around it. Stuff just works. Sounds like a marketing message but its true. You can focus on accomplishing the task rather than wrestling with shortcomings and crutches of the environment. Application developers on the Mac also have the philosophy to integrate with existing services as much as possible, which makes a huge difference, because most of the stuff you use is able to talk to each other. Compare that to Windows where every application/service is its own island.
Imho, OSX is by far the best platform out there right now bar none. It's amazing to see how even non-hackers are blown away once they switch.
You should too.