Best and quickest - a towncar
Cheapest - Mears depending on the number of people
My opinion although I am not sure you asked:
Mears will cost $29.00 adult and $21.00 child, per person round trip plus tip.
A towncar will cost between $80-$110 total (not pp) round trip plus tip most include a complimentary 30 minute grocery stop at a major chain.
With Mears you simply get your luggage and go to the Mears counter, purchase your round trip voucher and check in with a dispatcher outside. At this point your wait can be anywhere from 15-60 minutes for a van or bus to your resort. After boarding you may visit more terminals to pick up more passengers and you will most likely drop off at at least one other resorts before yours. For the return trip you will be picked up 4 hours prior to the flight and again you will pick up at other resorts on the way to the airport and probably visit several terminals before yours.
Experiences vary but my two trys with mears were as above and once we almost missed our flight home despite a pick up 4 hours prior. For me the convenience of a town car and the savings in groceries are well worth the minimal extra expense of a town car. When a personal size water costs $2.50 at WDW getting a case at the grocery makes for lots of $$ savings.
With a towncar a driver will meet you at baggage claim, assist you with your luggage if you like and drive your party and only your party to the resort, via grocery stop if you like. You arrange the pick up time and again you are picked up at your resort and taken directly to your terminal.
There are many great towncar companies including the sponsor
Fl Tours - HTH
TJ