We usually always use the curbside. The difference is they work for the airport and work for tips, where the people inside work for specific airlines from what I understand. At MCO, the inside line for Southwest has always been at least half an hour if not longer. For a $10 tip, curbside will take our bags and print our boarding passes and with a wait that has never been more than a few minutes. My time and frustration of waiting in line is worth it.