I voted AMD. I dont agree with some of the corporate policies of Intel, which I will not get into.

As much as I hate to admit it, Intel has the faster processor right now, the C2D. They also have a quad core version of this, the QX6700. Before that, AMD's K8 was thoroughly faster than anything Intel had... Wait 'till K8L comes out though, AMD will have it again. It goes back and forth. I'm sure when AMD is back on the performance throne, Intel will cut prices. Same story played out over and over again.

I personally like to buy processors from their server line, namely the Opterons. More thorough testing usually equals better overclocking. Also, and you wont hear this elsewhere, when you buy a higher level Opteron, like 185 vs. 165, you not only get more multipliers, you're very likely to get a better stepping than the lower level processor.

Of course, AMD's been releasing new sockets every time someone sneezes, and that's getting kind of annoying.