Performance wise - it really can't be said unless you dyno with the same bike on the same day with the same weather conditions - bascially, no one has done it. Everyone can claim each other is better.

The reality of the situation is that each brand makes a jet kit. They serve their purposes the same and are very similar in horsepower. It will end up being how good are you at tuning YOUR carburetor on YOUR bike?

So with that being said, make your decision based on which company you would rather give your business to. A company that is pollite and willing to help answer customer questions, or a company that shook off a potential customer when asking tech oriented questions. (By no means does everyone have the same experience that I did, but that's my two cents on it.)