Tezcatlipoca vs Manwë: who would win?

Manwë favored — Slight edge (~55%)

Tezcatlipoca · Toaru Majutsu no Index · Base

Tier

HIGH 1-C

Attack Potency

High Complex Multiverse Level

Speed

Sub-Relativistic

Durability

High Complex Multiverse 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.