When looking back at the Kaido and Big Mom fights, I find it interesting that Big Mom the one who is a bit more goofy compared to Kaido ended up having a more serious fight during her battle against Kid and Law.
Meanwhile Kaido who is a bit more serious compared to Big Mom ended up having a more goofy fight against Luffy, even though there were still moments where the fight was a bit serious it always went back and forth between being serious and being goofy.