Windows to Linux

I'm thinking about switching to Linux. Specifically Ubuntu or Fedora. Anyone want to tell me why or why I shouldn't? Currently using Vista Home and I like it but I just want to see what else is out there. Plus if its more secure, thats always a plus.

>>5 So far I've just been reading the main pages on the Ubuntu and Fedora's sites (features, etc.) any websites I could get real info on this? basically a beginners guide to Linux.