Eria the Water Charmer vs Daiba: who would win?

Daiba favored — Slight edge (~55%)

Eria the Water Charmer · Yu-Gi-Oh! · Raging Eria

Tier
8-A
Attack Potency
Multi-City Block Level
Speed
Supersonic
Durability
Wall Level, up to Small Building Level

Daiba · Berserk · Base

Tier
8-A
Attack Potency
Multi-City Block Level
Speed
Subsonic+, up to Massively Hypersonic
Durability
Multi-City Block Level

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