Thread:Enderverse/@comment-24874732-20190330144359/@comment-25075758-20190330152113

I mean, Vegito had Spirit Sword, a move that neither Goku or Vegata could use (at the time, Vegeta got it later in the DBS manga). Both their multipliers are hinted to be the same. (A + B) x 10s, the multiplied number hasn't been confirmed yet, just that it's at least 20.

My theory about the difference is that Potara is more convenient, and lasts longer when dealing with lower power levels. But the stronger characters get, the less time they spend fused, Vegito Blue was only there for a few minutes. So the time is directly tied to the earrings. Meanwhile Metamoran, or Fusion Dance, can last up to 30 min, and is directly dependent on how powerful the fusees are. Since both Goku and Vegeta had SSB, Gogeta lasted a full 30 min. But because Goten and Trunks didn't even have SS2, much less SS3, Gotenks didn't last as long.

Tl;dr, Potara is better for weaker power levels, while Dance is better for higher power levels.