Levi Ackerman vs Ghoul: who would win?

Levi Ackerman favored — Slight edge (~55%)

Levi Ackerman · Attack on Titan · Base

Tier

8-C, up to 8-A

Attack Potency

Small Building Level, up to Multi-City Block Level

Speed

Superhuman, up to Supersonic

Durability

Small Building Level

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

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