Artemis (Fate) vs Ambassador Darkness: who would win?

Ambassador Darkness favored — Slight edge (~55%)

Artemis (Fate) · Nasuverse · True Form

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

Immobile, up to Immeasurable

Durability

Complex Multiverse Level

Ambassador Darkness · Kamen Rider · Base

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

High Hypersonic, up to Speed Of Light

Durability

Complex Multiverse Level

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