If you donít like riding on possibly crowded shuttles then taking a taxi service to the airport may be better for you. However taxis usually can only hold about four people safely (with some exceptions in cases of taxi vans), so if you are traveling with a crowd it is best to take a shuttle service or even rent a stretch limo.
Still taking a taxi is a familiar and trusted form of airport transportation mainly because, unlike a shuttle, you can enjoy a more personal experience with the driver and even ask him to take a certain route if needed. Keep in mind that some cab drivers may only accept cash and not credit cards. You cannot pay for a taxi in advance, however you can with a shuttle to an airport.
Some airport shuttle service companies operate their shuttle service from the airport by using many small vans. These vans are held in a lot nearby and as soon as enough passengers (six to ten of them) have bought enough tickets to justify a trip from the airport into the city or attraction destination then the van is released from the lot and people are picked up. If the airport is really busy then you may be picked up by the shuttle service very quickly. If you have arrived at a slow time for air travel, then you may end up waiting on the curb for a while for the shuttle van to get going.