Were I Galactus, I'd pick Thor. His storm powers, amped by the power cosmic, could allow him to completely wreck a planet's bio-system. That would leave the molten core alone, and ready for Galactus to devour, but it would keep most of the people busy and they wouldn't be able to mount any sort of offensive.
Given the wide range of power Thor has shown in the past (mostly with mjolnir, I know) he has more versatility than Supes, easily. Teleportation, Time travel, energy manipulation on a huge scale ect. the idea that supes is as versatile is just silly. Besides as stated already Thor already has more of a natural mindset for such a thing and his powers would be a better match for the power cosmic.
Originally posted by Draco69
Superspeed. Heat vision. Superbreath. [B]Soul Vision . X-Ray vision...need I go on?In a crossover, Superman was called something akin to The Kryptonian as a herald of Galactus. And he was MAD powerful [/B]