Obsidius vs Archaon: who would win?

Obsidius favored — Slight edge (~55%)

Obsidius · Godzilla · Base

Tier

HIGH 4-C

Attack Potency

Large Star Level

Speed

Massively Ftl+

Durability

Large Star Level

Archaon · Warhammer Fantasy · Archaon

Tier

HIGH 4-C, up to LOW 2-C

Attack Potency

Large Star Level, up to Universe Level+

Speed

Massively Hypersonic, up to Speed Of Light

Durability

Large Star Level

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