We have used both and were equally pleased with both. Dollar charges extra if your spouse drives and Thrifty doesn't. Thrifty is off site and that is its downfall, but we were willing to do that since the price was so much better for our last trip. Thrifty asked us if we wanted to upgrade to a Grande Caravan, we declined and still got it. No matter what, join their fast lane programs and you will have fast service. Dollar did give us a brand new van with only 40 miles on it. Thrifty's van still had low mileage and a good vehicle. I plan to go with the lowest price for my next trip.
-Amy