Makima vs Alastor: who would win?

Makima favored — Favored (~65%)

Makima · Chainsaw Man · Base

Tier
LOW 7-C, up to HIGH 7-C
Attack Potency
Small Town Level, up to Large Town Level
Speed
Massively Hypersonic+
Durability
Multi-City Block Level+

Alastor · Hazbin Hotel · Base

Tier
LOW 7-C
Attack Potency
Small Town Level
Speed
Subsonic, up to Supersonic+
Durability
Building Level, up to City Block Level+

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