Another mac vote from me. If you're getting a laptop try to avoid the most basic white plastic model as this is the previous generation.

Used to be a big PC fan but converted a few years ago and never looked back. There's a massive list of benefits which the above posters have covered but my favourite feature has to be how quickly the thing switches on. The OS is rock solid and I often don't restart for months at a time. No constant popups which I often see at client sites too.

As has been said - it's a slippery slope though as you'll want everything to go with it, Apple TV, iPhone, Time Capsule etc.

Great pieces of kit though. Perhaps the only exception I can think of is if you're a gamer.