The big difference is that you are logged in and you request a car with your account. You've essentially rented the car from the moment you hit ok. Why does th

The big difference is that you are logged in and you request a car with your account. You've essentially rented the car from the moment you hit ok. Why does this matter? Because it means the car will actually show up. I live in San Francisco. The cabs here are terrible. You can't actually call a cab and have it show up. Most cabbies will pick up another fare if they see one on the way to you. Doing things like getting to the airport or generally arriving anywhere on time is nearly impossible if you have a 30 minute swing based on how many times you have to re-call the cab company to actually get somebody to show up. Want to be responsible and not drink and drive after that party? Don't count on getting home from a cab.