Adrestia vs Niffty: who would win?

Niffty favored — Slight edge (~55%)

Adrestia · Assassin's Creed · Base

Tier
8-C
Attack Potency
Building Level
Speed
Average Human, up to Subsonic
Durability
Building Level

Niffty · Hazbin Hotel · Base

Tier
8-C
Attack Potency
Building Level
Speed
Subsonic, up to Subsonic+
Durability
Building Level

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