Would be fantastic to see Plutonian vs Surfer in a proper comic fight, with Surfer in his current mindset.
If Surfer were to amp up, maybe even use mjolnir, I think he might take Plutonian.
Bette/Modeus seemed odd, iirc Plutonian was beating Modeus before, and easily, but with Bette-Modeus, he didn't want to strike her. So it was just sentiment that gave her/Modeus, the upperhand.