Yellow Diamond vs Asta (Final Saga): who would win?

Asta (Final Saga) favored — Slight edge (~55%)

Yellow Diamond · Steven Universe · Base

Tier

5-C

Attack Potency

Moon Level+

Speed

Relativistic, up to Massively Ftl+

Durability

Moon Level+

Asta (Final Saga) · Black Clover · Judgment Day Arc

Tier

5-C, up to LOW 5-B

Attack Potency

Moon Level+, up to Small Planet Level

Speed

Massively Ftl

Durability

Moon Level+, up to Small Planet Level

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