Myrrh vs Kaiju No. 9: who would win?

Kaiju No. 9 favored — Favored (~65%)

Myrrh · Fire Emblem · Base

Tier
6-B
Attack Potency
Country Level+
Speed
Superhuman, up to Massively Hypersonic
Durability
Large Building Level, up to Country Level+

Kaiju No. 9 · Kaiju No. 8 · Post No. 2 Absorption

Tier
6-B, up to 6-A
Attack Potency
Large Country Level, up to Continent Level
Speed
Massively Hypersonic, up to Ftl
Durability
Large Country Level

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