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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

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