Processor speeds are largely irrelevant these days due to the rapidly
changing state of processor development. The last time that I checked, Intel
processors were favored for their performance - but there was news about AMD
"catching up" very soon (haven't heard about that yet).
The decision regarding a processor is one that only you can make.
Unfortunately, it takes a bunch of reading and research to make an informed
choice. You'll find people who swear by the AMD's and you'll find others who
swear by the Intel's. Who's right? I dunno.
Finally, some consideration must be given to how you'll use the processor.
Do you game? Do you do a lot of video editing? Or, do you just surf the web
and check your email? Each processor has different things to offer for each
of these scenarios - and it'll get even more confusing as you blend them
together to try and get the most effective mix for your system.
Now, all this having been said - I'm an Intel fan myself.
- John