In Absolute terms? None, really. AMD's current best are simply not as fast as Intel's best.
In Functional terms, though, there's room for discussion. Especially on a performance per dollar basis, where the outcomes are going to be closer. i.e. comparing the overall performance of
"AMD's versus Intel's Best" is a normally a losing proposition for AMD. But it's a somewhat different argument when you're comparing $200 AMD processor versus $200 Intel one. In this case, you're going to find comparable
(within a close percentage overall) results regardless of which you choose. Sometimes one 'wins', other times the other. In other words: Keep an eye on which is on sale.
Checking the charts available here, as well as other sites, will give you an idea of which specific processor falls where. Please feel free to weight the benchmark that is most similar to your personal usage. Once you know roughly which is best for the job you intend it to fill, then you can check the E~tailer or physical store of your choice for the better deal.
http://www.tomshardware.co.uk/charts/2009-desktop-cpu-charts-update-1/benchmarks,60.html