Current Fat Buu is the weakest Buu there has ever been. Majin Vegeta crushes Basil.
XSU
XSUPREMEXSKILLZThe Immortal Emperor
Basil wins, undoubtedly.
DAM
DamborgsonKing of the Damboys
Majin Vegeta could probably pull it off. Buu only started getting the better of Vegeta after that huge AOE blast. Whereas against Basil before the fruit he was treating him like the first time he met Gotenks.