the sheet numbers that are supposed to measure the speed of a machine are obsolete. Macs simply multitask and handle the programs better. they are fast when it comes to getting work done, not nescessarily when it comes to numbers.
I have a powerbook g4 that is 2.5 years old now. it has 1.67Ghz processor and 2GB RAM. It runs all of my programs faster and freezes less than any PC I have worked on. It has never crashed, never had any sort of wierd errors like PCs get, and I can count the number of times in the last 2.5 years I have had to forcefully restart it because it froze on my fingers, not exaggerating.
IMO macs are more reliable, better running (if not faster as well) and just plain more baller than PCs.