Preceptor Miriam vs Autumn: who would win?

Too close to call

Preceptor Miriam · Elden Ring · Second Encounter

Tier
7-A, up to HIGH 4-C
Attack Potency
Mountain Level, up to Large Star Level
Speed
High Hypersonic
Durability
Mountain Level, up to Large Star 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.