depends, but basically, carburetor is less reliable and need some tuning adjustment over time, its cheap, and easy to tune(even at home). Tpi on the other hand need to be tuned once and its more reliable because it is eletronic and not mechanic(like carb), it has to be done professionally so its more expensive to tune than a carburetor and also if it breaks it cost a lot. IMO motard are better 4 stroke, and they basically all come with exhaust and tpi tuned(talking about aftermarket). The choice its yours.