Yellow Diamond vs Kronos (Riordan): who would win?

Yellow Diamond 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+

Kronos (Riordan) · Percy Jackson · True Form

Tier

5-C, up to HIGH 4-C

Attack Potency

Moon Level+, up to Large Star Level

Speed

Massively Hypersonic, up to Massively Ftl+

Durability

Moon Level+, up to Large Star Level

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