Charles Xavier vs Koji Shinjo: who would win?

Too close to call

Charles Xavier · Marvel · Base

Tier
10-A, up to 1-A
Attack Potency
Athlete Level, up to Outerverse Level
Speed
Superhuman, up to Immeasurable
Durability
Athlete Level, up to Outerverse Level

Koji Shinjo · Godzilla · Base

Tier
10-A, up to 4-B
Attack Potency
Athlete Level, up to Solar System Level
Speed
Superhuman, up to Massively Ftl+
Durability
Athlete Level

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