Nucleogenic Cloud Being vs Mechagodzilla (Heisei): who would win?

Nucleogenic Cloud Being favored — Slight edge (~55%)

Nucleogenic Cloud Being · Star Trek · Base

Tier

4-B

Attack Potency

Solar System Level

Speed

Relativistic

Durability

Solar System Level

Mechagodzilla (Heisei) · Godzilla · Base

Tier

4-B

Attack Potency

Solar System Level

Speed

Subsonic, up to Massively Ftl+

Durability

Solar System Level

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