Bianca (Dragon Quest) vs Alduin: who would win?

Too close to call

Bianca (Dragon Quest) · Dragon Quest · End of Story

Tier: LOW 2-C
Attack Potency: Universe Level+
Speed: Immeasurable
Durability: Universe Level+

Alduin · The Elder Scrolls · Base

Tier: LOW 2-C
Attack Potency: Universe Level+
Speed: Immeasurable
Durability: Universe Level+

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