i've used both mac and pc. i've used pc for years, and when i switched to mac, i haven't looked back since.
i like mac because of how things are organised in it, and how convenient it is to use. especially when running photoshop and other programmes. expose is awesome. another thing is, it's so easy to install applications, and everything is organised neatly into different sections. for most applications, all you need to do is drag the icon from applications folder into the trashbin, then it's gone.
or maybe mac is for really lazy people like me hahaha
but yes, ultimately, it's what you prefer to use. like different camera systems... go and try both out. i suggest you use a friend's mac instead of the store ones, since you can see how your friend uses his mac, with all his documents, applications, music, etc etc you know what i mean