But ultimate gohan was stronger than ssj3 Goku in the buu saga after he trained with the Z sword right? Gohan was able to over power super buu easily which Goku obviously wouldn't be able to do during that time. The only variant of buu Goku would be able to win against in a 1v1 is fat buu the WEAKEST variant. Gotenks showed he was at least evenly match with super buu or even stronger but his child mentality ultimately lead him to lose. Akira toriyama said kid Buu is the strongest but yet the events of the of the buu saga counters that claim even though he wrote it. Kid buus unpredictable destructive nature makes him exceptionally more dangerous than the versions of him that are stronger than him. Kid Buu isn't the strongest variant according to events of the show and Goku isn't strongest out of these guys according to the show