Question: is buu stronger than goku?
Answer: SSG Goku was stronger than SSJ3 Goku, who was about equal, if not slightly weaker than Kid Buu. They probably have about equal raw power, maybe giving a slight edge to Goku, but Buu is made out of magic. Basically, Buu won't run out of energy, he can regenerate, etc. Goku can't do any of that, so over time, he'll lose.