Yhorm the Giant vs Gigan (Showa): who would win?

Too close to call

Yhorm the Giant · Dark Souls · Base

Tier: 4-C
Attack Potency: Star Level
Speed: Supersonic
Durability: Star Level

Gigan (Showa) · Godzilla · Base

Tier: 4-C
Attack Potency: Star Level
Speed: Subsonic+, up to Massively Ftl+
Durability: Star Level

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