Ghidorah Rei vs Touka Kirishima: who would win?

Ghidorah Rei favored — Slight edge (~55%)

Ghidorah Rei · Godzilla · Base

Tier
LOW 7-C
Attack Potency
Small Town Level
Speed
Speed Of Light
Durability
Small Town Level

Touka Kirishima · Tokyo Ghoul · Tokyo Ghoul:re

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

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