Meruem vs Kaiju No. 15: who would win?

Too close to call

Meruem · Hunter x Hunter · Post-Rose

Tier
7-A
Attack Potency
Mountain Level+
Speed
Massively Hypersonic, up to Speed Of Light
Durability
Mountain Level+

Kaiju No. 15 · Kaiju No. 8 · Base

Tier
7-A
Attack Potency
Mountain Level+
Speed
High Hypersonic, up to Ftl
Durability
Mountain Level+

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