It depends on how many are in your group. Mears transportation is the cheapest if there are 1 to 3 people as the cost is aprox 25.00 per person round trip.
If there are more than 3 then really a town car service is the best way to go. The town car holds 4 people and their luggage and the cost is aprox $95-$115 round trip depending on which company you use and if you go to a MK resort the cost is higher.
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Most of us on the boards, prefer a towncar service. They are waiting for you up at the luggage area and take you right to your resort, most will make a short stop at a grocery store as well.
With Mears, you have to wait for the van or shuttle, and then it goes to different hotels, so you could be the first one off, or the very last and it is time consuming.