Yellowback vs Raven Beak: who would win?

Raven Beak favored — Slight edge (~55%)

Yellowback · Godzilla · Base

Tier: 6-B
Attack Potency: Country Level+
Speed: Subsonic
Durability: Country Level+

Raven Beak · Metroid · Base

Tier: 6-B
Attack Potency: Country Level+
Speed: Sub-Relativistic
Durability: Country Level

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