According to the anime (and, for some reason, Viz), he's stronger than his father/previous incarnation, so that's the answer if talking about the anime. Considering the original text of the manga never says this though and it being so would make Galu's comment on Piccolo's strength when meeting him 3 years later redundant, he's at least far stronger than average humans manga-wise and at most probably weaker than Prime Daimao. However strong you consider him beyond that broad range is pure speculation.