Kaiju No. 9 vs Kamikaze: who would win?

Too close to call

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

Kamikaze · One-Punch Man · Base

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

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