Quote:
Originally Posted by
Artisan Fan 
Leica makes the best lenses but the ED glass on Nikon is just as good as Canon in my experience.
Yeah, slightly better for some lenses, slightly worse for others, but as a range pretty comparable (based on internet opinions I've read; I don't have any Nikon experience).
Still, if you have an idea of the type of photography you're interested in, choosing a system based upon which has better lenses for your purposes is a good recommendation. If not, you can still rest assured that either is a good choice.