We are picking up our rental car at FCO and returning it to Rome Termini a week later after our stay in San Gusme. Does anyone have a preference between Hertz and Avis? We have always used Auto Europe before, but have recently heard of long lines at some of the agencies they assign you to at FCO. Last time, we rented through Auto Europe and we were assigned Maggiore - took forever to get our car at FCO. This time, we thought we would just "pick our poison" ourselves. We are currently not preferred members of either of these companies, but may join once we decide on the company. The rates for each are comparable.