Vegito, the fusion of Goku and Vegeta, would have likely defeated Buu.
Vegito's immense power, a combination of Goku and Vegeta's strength, far surpassed Buu's. He effortlessly overpowered Buu in their brief battle, showcasing superior speed, strength, and ki control.
While Buu possesses regeneration and absorption abilities, Vegito's overwhelming power likely would have prevented Buu from effectively utilizing these abilities. Vegito's energy blasts and martial arts skills were demonstrably more potent than anything Buu could throw at him.
Furthermore, Vegito's strategic thinking and tactical prowess likely would have allowed him to exploit Buu's weaknesses and create opportunities for a decisive victory.
While Buu's adaptability and regeneration make him a formidable opponent, Vegito's sheer power and tactical advantage suggest a high probability of him emerging victorious.
