My wife and I are pretty loyal to the Sun Prairie location because it was much closer to us before. The west side location has similar products, but some noticeable differences. My wife can find langostino lobster here and Lindeman's Framboise. They seem to have more beer selections it seems. It's disappointing that we haven't been able to find the breakfast quiches that we normally get, in either location. The only thing with Costco is if you love a product, you should try and stock up on it because you'll never know when they'll get rid of it and it never returns.