Ghoul vs Jiji: who would win?

Jiji favored — Slight edge (~55%)

Ghoul · Dungeons & Dragons · Abyssal Ghoul

Tier
8-C
Attack Potency
Street Level, up to Island Level
Speed
Subsonic, up to High Hypersonic+
Durability
Wall Level, up to Small City Level

Jiji · Dandadan · Accessing Ki

Tier
9-A, up to HIGH 8-C
Attack Potency
Small Building Level+, up to Building Level+
Speed
Superhuman
Durability
Building Level

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