Arabia Fats vs Ryubee Sonozaki: who would win?

Ryubee Sonozaki favored — Slight edge (~55%)

Arabia Fats · JoJo's Bizarre Adventure · Base

Tier

10-B, up to HIGH 8-C

Attack Potency

Human Level, up to Large Building Level

Speed

Immobile, up to Speed Of Light

Durability

Human Level

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

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