Depends on what you want for your money. Shared shuttle like Mears or the Flyer Express thing are cheaper per person, but take longer because they stop multiple places. Larger groups of more than one or two are just as well off with hiring a towncar or van that goes directly to the resort, or a rideshare service like Uber/Lyft for 3-4 passengers (they do larger parties but it costs more, and dynamic pricing may mean you pay more than you want to). There's apparently a whole other consideration if you need car seats for children. That's for MCO, no idea what is available in Sanford.