Isolde vs Darunia: who would win?

Isolde favored — Slight edge (~55%)

Isolde · Nanatsu no Taizai · Base

Tier

6-C, up to 4-B

Attack Potency

Island Level, up to Solar System Level

Speed

Sub-Relativistic

Durability

Island Level, up to Solar System Level

Darunia · The Legend of Zelda · Base

Tier

6-C

Attack Potency

Island Level

Speed

Supersonic+, up to Relativistic

Durability

Island Level

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