AAAAAHHHHHHHH!
Basically, Pentiums give you slightly higher performance for a huge increase in price, and are known to be better with high-demand apps than AMD, whereas AMD is generally considered better for gaming.
AMDs are also known to run a little bit hotter.
I think if you're on a budget, gaming only with your PC, or looking for a high performance/cost ratio you should get an AMD.
If you have a lot of money to spend and you run a lot of taxing progs, go Intel.
People argue over this topic day in and day out and solve absolutely nothing. It might as well be an argument between religions or politics.