For the type of workload you are doing on your PC, I seriously doubt you will notice ANY difference between either chip...
I'd be more concerned on which chip architecture has the highest bus bandwidth and memory bandwidth associated with it and the motherboard, as those are the usual "choke" points in PC's (excluding disk I/O in this discussion), but that's just me.
With Intel's latest offerings, I'd probably go with them. If your a little light on cash, then AMD would be a solid choice, as we are probably talking differences in milliseconds on which architecture executes instructions faster than the other...
