Piccolo (with Kami; Saiyan Saga) vs Vegeta (Saiyan Saga)

[Super Saiyan Overlord1007]

I give Piccolo and Kami's unification a little more than a 2x boost. So he beats Nappa, but gets slaughter more brutally than Vegeta.

 

[Zippy]

Imo namek fusion is plot based but going on the boosts we have seen vegeta would win imo