Marcus Pierce vs Mantleclaw: who would win?

Too close to call

Marcus Pierce · DC · Base

Tier: 9-B
Attack Potency: Wall Level
Speed: Superhuman
Durability: Wall Level

Mantleclaw · Godzilla · Base

Tier: 9-B
Attack Potency: Wall Level
Speed: Superhuman
Durability: Wall Level

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