"I would have to say that the Buu team has the better chance of winning for the following reasons: Majin Vegeta should not last that long in this battle, his power allowed him to briefly fight on equal terms with Fat Buu however due to the Buu's limitless stamina and regeneration not to mention his greater power he proceeded to manhandle Majin Vegeta severely injuring and even after releasing most of his energy in a suicidal explosive energy wave sacrificing his life it was not the sufficient power to destroy Fat Buu. Fat Buu should be able to easily handle Majin Buu if he is serious in this battle and does not perceive it as a simple game. Super Saiyan 3 Gotenks should have the sufficient power to destroy Fat Buu if he takes the battle seriously but if one considers his personality he would fail to defeat him as the amount of energy consumed by the fusion is immense, Super Saiyan 3 Gotenks whilst maintaining his cockiness managed to nearly destroy Super Buu who possesses much more power than Fat Buu so one could assume that even while taking it as a joke Super Saiyan 3 Gotenks should have enough power to completely destroy Fat Buu. Mystic/Ultimate Gohan if he takes this battle seriously should be able to quickly defeat Super Buu. And though there are certain hints that Mystic/Ultimate Gohan might be nearing or is higher than a Super Saiyan 3 he clearly does not possess the energy of the form, Super Saiyan 3 Gotenks is significantly weaker than Super Saiyan 3 Goku and much more cocky and believes himself to be the mightiest warrior in the universes nearly always underestimating his opponents so if Super Saiyan 3 Gotenks were to fight Kid Buu he would lose miserably considering that Kid Buu could regenerate from virtually all of his attacks and was able to make Super Saiyan 3 Goku who is more powerful than any Gotenks form suffer terribly during their fight. If Gotenks fought Kid Buu he would lose because of massive energy consumption and overall a weaker power level. Kid Buu is the only actual problem in this battle. I do not see how Super Saiyan 3 Gotenks could compete with him considering that he has a significantly lower power level and the fusion lasts for very little time and even more so because of Kid Buu's physical stature it will motivate Gotenks to be even more cocky and waste even more time. Mystic/Ultimate Gohan has never shown the sufficient energy to vaporize Kid Buu, the amount of energy needed was only found in the Spirit Bomb (the energy of every sentient being on Earth). Majin Vegeta would be defeated by Fat Buu while Fat Buu would proceed to be defeated by either Mystic/Ultimate Gohan or Super Saiyan 3 Gotenks then Super Buu would proceed to either be defeated by Super Saiyan 3 Gotenks or Ultimate/Mystic Gohan if he does not absorb anyone in this battle and later on Kid Buu would proceed to defeat Ultimate/Mystic Gohan who does not possess the necessary energy projection to truly eliminate Kid Buu and I would assume that by the time Kid Buu is the last the Buu in the battle the Gotenks fusion would have already ended. Also one could say that Kid Buu could simply destroy the planet rendering the Saiyans without oxygen to survive but that would only apply if they are fighting on a planet. ND "
Nice post, but what if team 2 had a plan. What if gohan takes on fat and super buu. Whilst gotenks ssj3 and majin Vegeta try holding him off. If Mystic tries to end the foght quickly he should be able to dispose os fat and super buu. Which would mean kid buu would be in alot of trouble.
I don't know if that would work, as a full power blast by goku did not phase buu, in fact buu just came back in the hundreds, and bombarded goku with energy blasts.