The Chibi Kiriyama

I feel the two were very, very close in terms of power. I feel that a lot of the third Boo's damage was taken due to the general inconsistency of any Boo form, and that the two were on the same level of power up until Super Gotenks showed that he might be capable of creating a continuous stream of chi that could get rid of Boo altogether. But at the end of the day, I feel the third Boo incarnation coupled with Piccolo's intellect would have an edge even if Super Gotenks had the benefit of some amazing skills to work with. He might get beat down just the same as his Piccolo-less state given the small amount of chi Piccolo would offer, but he might devise a plan that would play off of Super Gotenks' arrogance.