While generally an AMD fan also, pretty much every hardware review site (sorry, too lazy to look them up) ranks laptop processor performance this way, from fastest to slowest:

Intel Core 2 Duo Extreme (Conroe)
Intel Core 2 Duo (Merom)
Intel Core Duo (Yonah)
AMD Athlon 64 X2 T-xx (higher numbers are faster)
Intel Celeron M & AMD Sempron - toss up

In Core 2 Duo, the T series is fastest, followed by the L series and the U series. The U & L series are not used for performance but for low energy use and heat output. In both Intel and AMD series, higher numbers give better performance (and cost more), e.g., Core 2 Duo T7600 will be faster than T5600.

Note, this is laptop only. I still prefer AMD for desktop processors, mostly because of the bang for the buck.