Frieren vs Renji Yomo: who would win?

Renji Yomo favored — Slight edge (~55%)

Frieren · Frieren: Beyond Journey's End · Base

Tier
LOW 7-C, up to 7-B
Attack Potency
Small Town Level, up to City Level
Speed
Hypersonic
Durability
Small Town Level

Renji Yomo · Tokyo Ghoul · Base

Tier
LOW 7-C, up to HIGH 7-C
Attack Potency
Small Town Level, up to Town Level+
Speed
Massively Hypersonic+, up to Sub-Relativistic
Durability
Small Town Level, up to Town Level+

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