Who knows. DBZ and GT are almost worlds apart. The series itself is painfully inconsistent. However if I had to choose id say Gogeta. You have to assume regular ssj4 could school an ssj3 in the same way Bills did. Evidence of this would be the power disparity between say ssj1 Goku on namek and ssj2 Gohan cell sega. If you assume that same sort of power increase happens from ssj3 to ssj4 than you can sort of imagine that an ssj4 would look a lot like Bills did vs Goku. Multiply that exponentially and well i cant imagine a more powerful incarnation.
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