E-105 Zeta vs MGR-IInd: who would win?

MGR-IInd favored — Slight edge (~55%)

E-105 Zeta · Sonic · Base

Tier
4-B
Attack Potency
Solar System Level
Speed
Immobile, up to Massively Ftl
Durability
Solar System Level

MGR-IInd · Godzilla · Base

Tier
4-B
Attack Potency
Solar System Level
Speed
Subsonic, up to Speed Of Light
Durability
Solar System Level

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