I've used Budget, Avis, Enterprise, and most recently Alamo. They are all pretty much the same imo. About the biggest thing is expect around an extra $100 on your rental if you are taking the car out from an airport. My Salt Lake City rental with the walk away insurance should have been about $180-$190. With the airport/state/city fees they tacked on it came to $279. DIA has the same bs and just about every other airport I've been to.