Charlie Morningstar vs Gwess: who would win?

Charlie Morningstar favored — Slight edge (~55%)

Charlie Morningstar · Hazbin Hotel · Base

Tier
9-C, up to 5-B
Attack Potency
Street Level, up to Planet Level+
Speed
Subsonic+, up to Supersonic
Durability
Street Level, up to Planet Level+

Gwess · JoJo's Bizarre Adventure · Base

Tier
9-C, up to 9-B
Attack Potency
Street Level, up to Wall Level
Speed
Below Average Human, up to Average Human
Durability
Wall Level

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