Done both, at the Dolphin they usualy bring your car round by Valet, you need to jump in , adjust and drive. At the other location you go out to your car in the lot and have as much time as you need to fire up your satnav and get used to a new car. Your choice, but I know what I am happier with!
We were picked up by the Alamo Shuttle and taken to Disney Car Care last year then returned our car to MCO. All very easy, however I was more than a little irritated by the hard sell at the desk by the Alamo lady and then her rudeness when we declined. I had booked a compact car (on holiday Autos website a Nissan Versa or equivalent) for myself and DH. She tried to tell us all they had was a Fiat 500 and that it wouldn't be big enough so we would need to upgrade. I pointed out that we had been doing this for years and that the website quoted the Versa. She said they had been very busy and were low on stock, pretty well chucked the keys at us and gave us a bay number which had a Nissan Versa in it after all. Went back in to check that we had the Toll Charge reader to hear the couple behind us thank her profusely, saying that 'they don't tell you that the cars are smaller when you book the car in the UK' as they counted out over $300 in cash!
Picked up our compact car from Alamo at MCO this year on the 4th of July. Got our choice of compact cars from a long line and picked a Mazda 3 which is fab. No hard sell! 
