Goku would win. Him blasting Kid Buu off the face of the universe helped solidify that he is really one of the best fighters in the universe. I don't give a f*ck what anyone says. He defeated a psychotic little pink bastard that has destroyed solar systems(destroying f*cking Earth and all of humanity too) and is literally pure evil and whose only thought is to kill. That's pretty badass.
"Talking to Thierry Henry helped me through a rough time." - Zlatan Ibrahimovic
"when they ate the apple, i believe the second law of thermodynamics became what it is today " -Gogh