Obviously this will be your first if your having to ask a question like this. Anyone can jump in a sky barge and drive it fast, but a Supra is a drivers car. If you dont respect it it will bite you in the arse as good as look at you. It has a stronger engine from the out set, more powerful engine also. The car is built to a high standard and not to the standard of a 90's taxi.
Over all the Supra is a magnificent piece of engineering where as the sky barge is just another car with a suped up engine. Its was built with the idea of being a supercar not a high performance car like the sky barge. Once you take the delivery of your supra it will all become clear.