Just to clarify, the Yellow Cab app can do most of what the Uber app does including tracking the vehicle as it approaches. It allows you to pay in advance through the app as does Uber but unlike Uber, you also have the option of paying at the end of the ride with a credit card or cash.
We compare prices and in nearly all instances, Yellow Cab is less expensive. Unless things have changed, for those arriving at Pier 91, the ride share pick up lot is ¼ mile from the terminal. Yellow Cab can pick up at the terminal.