Guess it depends on gaps.
Super Boo + Gohan > Super Boo + Gotenks > Gohan > Gotenks (12) > Super Boo
* Gotenks kicked Super Boo's ass, but I guess from his earlier performance that he can only do so when he's serious, meaning he's not far stronger.
* Gohan isn't much stronger than Gohan, which is why he lost to Boohan, though he manage to resist a little.
I guess that Boohan is more or less twice as powerful as Gotenks. So, unless you have Vegetto five times as powerful as Boohan or so, he's not going to win this fight.