Seiichi Samura vs Sawatari Akane: who would win?

Seiichi Samura favored — Slight edge (~55%)

Seiichi Samura · Kagurabachi · Base

Tier

9-A, up to 7-B

Attack Potency

Small Building Level, up to City Level

Speed

Massively Hypersonic+, up to Sub-Relativistic

Durability

Small Building Level, up to City 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.