Meruem vs Reno Ichikawa: 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+

Reno Ichikawa · Kaiju No. 8 · Numbers Weapon Suit (Post-Training)

Tier
7-A, up to HIGH 6-A
Attack Potency
Mountain Level+, up to Multi-Continent Level
Speed
High Hypersonic, up to Sub-Relativistic
Durability
Mountain Level+, up to Multi-Continent Level

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