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Settle it, who's stronger.
- A Poll for Dragon Ball FighterZ
While the effects of the Potara have changed a little from the way they were originally described in Z, I'm pretty sure the Kais explicitly said that fusion with the Potara was stronger than that of Metamoran fusion, and imo it makes sense. Potara are tools of the gods, whereas the Fusion dance is a mortal-devised technique.