Kamen Rider OOO vs Contumelia: who would win?

Contumelia favored — Favored (~65%)

Kamen Rider OOO · Kamen Rider · Heisei Generations FINAL

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

Massively Ftl+

Durability

Complex Multiverse Level

Contumelia · Ben 10 · Base

Tier

1-C, up to 1-B

Attack Potency

Complex Multiverse Level, up to Hyperverse Level

Speed

Immeasurable

Durability

Unknown

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