Solo/Sofia vs Martin Mertens: who would win?

Martin Mertens favored — Slight edge (~55%)

Solo/Sofia · Dragon Quest · End of the Game

Tier
LOW 2-C
Attack Potency
Universe Level+
Speed
Immeasurable
Durability
Universe Level+

Martin Mertens · Adventure Time · Post-Catalyst Comet

Tier
LOW 2-C
Attack Potency
Universe Level+
Speed
Omnipresent
Durability
Universe Level+

A heuristic estimate from normalized VS Battles Wiki stats: tier, attack potency, speed and durability.