You just need to come and have a look really, as beep says, get a feel for the place and where you think you'd be happy. Other than that, go through the prospectus and make a shortlist based one what size of college you'd want to be in, where it is located, and how you think it sounds based on that. Draw up a list, and I'm sure if you've any more questions there are people on this board from almost every college that can answer them.
However, to answer your question Catz is comfortably the best.