Elza vs Sawatari Akane: who would win?

Elza favored — Slight edge (~55%)

Elza · Toaru Majutsu no Index · Base

Tier

9-A

Attack Potency

Small Building Level

Speed

Sub-Relativistic

Durability

Small Building Level

Sawatari Akane · Chainsaw Man · Base

Tier

9-A, up to 8-A

Attack Potency

Small Building Level, up to Multi-City Block Level

Speed

High Hypersonic

Durability

Small Building Level, up to Multi-City Block Level

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