Best thing to do would be to go to a retailer and try both out.
My vote goes to the 7d. I have used both and I prefer It over the Nikon. It has a faster frame rate, bigger buffer, and more accurate focussing (not as many focus points but all are cross reference) it just feels altogether better in my hands. All the buttons just feel to me like they are in the correct place.
The Nikon is more customisable but if you shoot RAW, as you should really with either of these cameras to get the best out of them, then then a lot of the custom settings have little impact as they are meant to enhance the JPeg image.
Of course all of the above is just my opinion.