I've been looking at getting some race wheels. Most of the wheels say they have 2 options. Either Shimano or Campy. What is the difference between the two? I thought I remember seeing a site that showed a comparison, but can't find it again.
Describes what hub they have, and thus what drive train they are compatible with. Most likely your bike has a Shimano drivetrain, so that is the kind of wheel you would need.
The Campy or Shimano refers to the hub compatability. So if you have Shimano cassette/ derailleurs on your bike, you will need a Shimano compatable hub. As far as a comparison of Campy & Shimano, I wouldn't touch that one with a ten foot pole! That particular topic seems to evoke a passion the like of which I have never seen.