Superman Vs Majin Buu

The Man of steel Vs Manjin Buu

This maybe will be a close battle. Superman is very strong, but if he blew up Majin Buu into pieces, then he will regenerate after that.

Please don't make fights about characters from Dragonball Z after the Freiza saga, it doesn't matter WHAT you throw at them they're always going to make up some cheap excuse to be more powerful. It would take something like Galactus or The Living Tribunal to put up with Majin Buu, in ANY of his forms.. Not to meation Buu is more likely to absorb Supes and become "Super Buu 2" and sport an SB over his chest and look really dumb..