On topic - I prefer AMD if only for the price. I also find an AMD processor very easy to overclock, though I've never tried to overclock an Intel. My AthalonII is at 3.5gHz.
I've had the opposite experience. I could never get more than a tiny OC on AMD, but I'm running a Q6600@3.4 and an i7 930@4.1, and several others somewhere in between.. I started switching to Intel over 3 years ago. Things may have changed since then.
Before I started Folding, I always built my game systems with second tier AMD processors. It gave me the most bang on a limited budget. If I wasn't Folding, I'd probably still be building with AMD, but moved up to top tier.