I've build several computers and the AMD's always end up giving me more trouble. Intel chipsets are more stable in my experiences.. Also.. as of late Intel has moved way ahead in the speed race. If you are building a killer machine... Intel 3ghz w/ 800mhz fsb is going to make you forget your computer is even there.
AMD is cheaper though and that draws many people.
At the end of the day though.. either will work. If your building a machine.. do some research on your parts (
www.tomshardware.com) and get pieces (motherboard and ram mainly) that are the highest rated. Every time I pick a piece based out of coolness or something and dont research the listings it is the first that fails and I end up replacing.
THE RIGHT MOTHERBOARD IS CRITICAL.....