This is the advice that you will be given by everyone:
Go try them in the shop before buying. They differ in feel, handling, menu's etc. Both are capable cameras so really down to the choice of feel.
Also don't be tempted by sway. I'm a Canon owner but wouldn't suggest to you go buy the Canon. Up to you, but as said it's all in the grip and feel.
Just my tuppence worth.
Roo
PS Canon are the best Nikon is cr@p
