As i was going through about ama sessions for an overview on telegram community i found the founder of STP network mike has given a strong reason why They have choosen bittrex and he said advantage to launch ico on Bittrex because its one of the oldest exchange platforms, which has a significant user base and It also has a robust local resource in Korea because they have a partnership with Upbit.
Right. Bittrex is an old exchange and has strong traders base. see how quickly the IEO finished and even listing of tokens also done.