Azathoth vs Manwë: who would win?

Azathoth favored — Slight edge (~55%)

Azathoth · Cthulhu Mythos · Base

Tier

HIGH 1-B, up to 1-A

Attack Potency

High Hyperverse Level, up to Outerverse Level

Speed

Omnipresent

Durability

High Hyperverse Level, up to Outerverse Level

Manwë · Lord of the Rings · Prior to entering Eä

Tier

1-A, up to HIGH 1-A

Attack Potency

High Universe Level

Speed

Immeasurable

Durability

Outerverse Level, up to High Outerverse Level

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