We've only used Alamo once (in January) and admittedly at MCO not Sanford, but have used Dollar on a number of occasions. Biggest bonus for Alamo over Dollar is that you get to pick your car with Alamo whereas Dollar simply allocate you one. That having been said, we have never had a bad car from Dollar.
In Jan we had a luxury booked, and when we arrived the guy checking us in, tried to convince me to have a Cadillac SRX, which is a sort of 4x4, for a load more money. So say, they had only just received the stock in, and "normally" they would be $700+ per week, and he was prepared to let me have ot for around $30-40 extra per day. Needless to say I declined his kind offer. Then low and behold there was one parked in the luxury lot, so we just took it
Guess I'm saying just be a little careful with Alamo as far as this is concerned. In contrast, ever since we started booking luxury cars through Dollar, we have never had someone try to get us to take something different.
Just out of interest, have you tried Airline Network for a quote? We've useed them a number of times, and they can be competitive, albeit in January we used USRentacar, as we wanted to use Alamo and Airline Network only used Dollar at that time.
Boss