I'd rather hold razor blades and bricks to get good images than ones I'm half hearted about. Nikon feels good..but that not the point.
I've looked close at availability and options on canon -vs- nikkor lenses.... My choice is CANON hands down!
Go to
www.photosig.com and look for images you like and see which camera they used.
best super fine detail on birds is Canon XTi to 1d w/ 100-400L IS USM
best landscapes.still lifes are Nikon.
Toss-up on sports
Heavy post images seem to come from Nikons
true to life images seem to come from Canon.
just my observation....