Cantarella Fisalia vs Metal Mystic: who would win?

Cantarella Fisalia favored — Slight edge (~55%)

Cantarella Fisalia · Wuthering Waves · Base

Tier

5-A

Attack Potency

Large Planet Level

Speed

Sub-Relativistic+

Durability

City Level

Metal Mystic · Teenage Mutant Ninja Turtles · True Form

Tier

5-B, up to 5-A

Attack Potency

Planet Level+, up to Large Planet Level

Speed

Hypersonic

Durability

Planet Level+, up to Large Planet Level

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