According to a video i found long ago...

[withheldforprivacy]

...on youtube but i can't find now (it probably does not exist anymore), the correct chain of Buus is...
Fat Buu>Grey Buu>Kid Buu>Good Buu

...because Fat= Grey + Good and Good fared better against Kid. SSJ3 Goku was more powerful against Fat, because he had a dead body, as
opposed to his living body against Kid.
Does anybody believe this?

 

[Tapion]

By powerscaling, that should be true.

But by statements:
Kaioshin: “….Yes…the heart which he gained by going so far as to lower his power through absorption…has returned once again to the way it was…he has no self-control whatsoever…he has become evil itself…”