I voted AMD because they seem to be ahead of the game. An AMD proc, with a 333 mhz fsb, rated at 1.83 ghz (barton core) runs as fast or faster than an intel 2.5 ghz model, which has a 533 mhz fsb (usually)
Also, ive noticed that their processors are much cheaper than Intel's. The top of the line P4, (extreme ed. or whatever) is almost 1000 bucks, depending on where you get it, whereas the top of the line AMD (which is 64 bits for future good-ness) is MUCH cheaper.
My three cents...