Nikon is superior in the sharpness of photos while Canon is superior in colour and videos. And the former is also less costly than the latter.
I used to have a Nikon when I was focusing more on pictures but I switched to Canon because I've been doing more videos. =[b]3[/b]=
Bottomline; Canon, for now.
I prefer Nikon because of the flash exposure control, it also provides flash sync options where even the cheapest Nikon DSLR can usually get it right on the 1st shot.