Cyno vs Autumn: who would win?

Cyno favored — Slight edge (~55%)

Cyno · Genshin Impact · Base

Tier
7-A
Attack Potency
Mountain Level
Speed
Massively Hypersonic+
Durability
Mountain Level

Autumn · Undead Unluck · Base

Tier
7-A
Attack Potency
Mountain Level
Speed
High Hypersonic
Durability
Mountain Level

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