Base Gotenks vs. Majin Vegeta

2 rounds.

1. Base Gotenks before his ROSAT training.
2. Base Gotenks after his ROSAT training.

This is SSJ2 Majin Vegeta.

Majin Vegeta, should win both. Because I remember it being accepted that ssj Gotenks is roughly equal to ssj3 Gokou. Which means Gotenks would be weaker at base.

1. Vegeta
2. Gotenks

Gotenks easily.

Majin Vegeta at his best was SSJ2 Goku’s level, where as Goku told Vegeta if he had transformed to SSJ3, he would have casually beaten Vegeta in their fight.

Where as Majin Vegeta was nothing to fat Buu, the weakest of them all. And we know Gotenks was stronger than fat buu, evil buu, but weaker than Super Buu. But was still able to entertain said Buu without outright dying.

But Base Gotenks wasn't stronger than Fat Buu. When they first fuse, they go and lose to Fat Buu in base form.