We have used Mears, a cab and Tiffany, costing all about the same $. Tiffany is by far the best.
Mears takes a bus load of passengers and you may go to many different resorts before you get to yours, also you fight through people when you arrive to get on one of the buses.
Cab, what can I say, noisy, rattlly old cab.
Tiffany, meets you at the air port with your name on a clip board and they help with your bags and wisk you away to your hotel. They also track your flight to know if it has been delayed, etc. Typically this is a Lincoln Town car.
(If you have the extra cash the limo is excellent, I think we paid $230 round trip)