This varies, for example, it can vary the distance of kaido against your opponent, whether he is near or far.
But I think KAIDO can be faster.
Kaido went to his dragon form and luffy used G4 a slower form, which really adds points to my thinking, kaido going to his dragon form is just an excuse to make the fight last longer (author's excuse) ...
Because by logic most of the characters on the roof, except luffy, do not support a divine diagram.