Picked up from Enterprise at MCO on December 9th. No Corvettes available. They were pushing a Maxima and a Q50 as their Luxury options. Went with a Tesla Model S for $45 more than my Luxury reservation. Charged it right at my hotel (Marriott Swan/Dolphin).
National had a good selection - saw both a Maserati Ghibli and Quattroporte being rented out. A few Expeditions, Escalades, and an E-Class mercedes.
As noted above - Alamo had the biggest line and was seemingly doing 80% of all the rental service.