Easily both rounds for Vegito. The anime made base Vegito fight to prove Buuhan was outclassed no matter which form he took be it candy or base. I honestly believe that whole serious thing for Buuhan was BS. The only reason Vegito went SSJ at all was because he did so in the manga. And to show Vegito was untouchable. And Buuhan was frustrated while he was warming up further showing his superiority. And Janemba gets one-shotted easily, he is fodder to Vegito.