Well the Sussex campus is right next to Brighton. Pretty much everyone I know in Brighton has great things to say about it, and same with pretty much everyone I know who has visited Brighton. I don't know much about Exeter, but Brighton is a very good place to be right now, especially for a student. Very lively, lots of cafes and pubs, a beach and a generally Bohemian atmosphere. I'd be surprised to hear Exeter has a good a student life as Brighton. If I wasn't here right on the other side of England in Newcastle University, I think Brighton is definitely the place I'd want to be.