Joshua vs Gelda: who would win?

Gelda favored — Slight edge (~55%)

Joshua · Adventure Time · Base

Tier

HIGH 7-A

Attack Potency

Large Mountain Level

Speed

Ftl

Durability

Large Mountain Level

Gelda · Nanatsu no Taizai · Base

Tier

HIGH 7-A, up to 6-C

Attack Potency

Large Mountain Level, up to Island Level

Speed

Sub-Relativistic+

Durability

Solar System Level

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