Ryubee Sonozaki vs Barrump Barrump: who would win?

Barrump Barrump favored — Slight edge (~55%)

Ryubee Sonozaki · Kamen Rider · Base

Tier

10-B, up to LOW 7-B

Attack Potency

Human Level, up to Small City Level

Speed

Average Human, up to Ftl

Durability

Human Level, up to Small City Level

Barrump Barrump · DC · Base

Tier

10-B

Attack Potency

Human Level

Speed

Subsonic, up to Ftl+

Durability

Human Level

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