I'm looking to outfit a new camara system with a large selection of lens and would like to know what company has a better lens selection ?
Tough.
For example a diamond of the Nikon lens setup was the 14-24mm f2.8. Now Canon published a 11-24mm f4, which seems to be excellent. Then again one can get the new Tamron 15-30mm f2.8 VC for either system as well, and this seems to be optically at least as good as the 14-24mm.
Another very nice practical lens of Nikon was their 16-35mm f4 IS(*). Canon offers exactly the same now. Neither of them is optically a stunner, but still.
On the other hand, Canon had a great 70-200mm f4 IS(*), which Nikon only introduced just when I got my camera 2 years ago.
Canon had a 100-400mm f4.5-5.6 IS(*) thats pretty popular, Nikon recently updated their 80-400mm f4.5-5.6 IS(*) for much of the same effect.
Canon also clearly has the better specialized lenses, like their tilt/shift can tilt and shift independently or that 65mm macro lens with 1:1 to 5:1 magnification. They also have a famous 85mm f1.2 hulk of a portrait lens, though the Nikon AF 135mm f2 DC is also quite famous. Still, an f1.2 lens with AF is nothing to sneeze at. Theres also a 50mm f1.0 for Canon, but thats prohibitevely expensive and only available on the used market.
Canon recently upgraded their 24-70mm f2.8. It is twice as expensive as the precedessor, but optically excellent. The Nikon 24-70mm f2.8 is a bit dated now. Neither of them offer IS; for that one has to get the Tamron version or use the Canon 24-70mm f4 IS.
Obviously Canon has a better selection of lens
but can you afford them?
e.g. 400 2.8 - $10,000, 200-400 - $10,000
pretty soon you're need a 2nd or 3rd mortgage
What the heck ? Nikon also offers a 400mm f2.8 IS(*) and a 200-400mm f4 IS(*) ?
(*) IS = Image Stabilization. Actually only Canon uses the shortcut "IS", everybody else has some other shortcut for the same. Nikon calls it "VR" for "Vibration Reduction", Fuji calls it "OIS" for "Optical Image Stabilization", Tamron calls it "VC" for "Vibration Compensation", Sigma calls it "OS" for "Optical Stablization", Sony calls "OSS" for "Optical Steady Shot", etc.