The Red Stone of Aja vs Aoi Kaguragi: who would win?

Too close to call

The Red Stone of Aja · JoJo's Bizarre Adventure · Maximum Power

Tier
7-A
Attack Potency
Mountain Level+
Speed
Speed Of Light
Durability
Unknown

Aoi Kaguragi · Kaiju No. 8 · Post-Second Division Training

Tier
7-A
Attack Potency
Mountain Level+
Speed
Unknown
Durability
Mountain Level+

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