Set (Riordan) vs Miao Ying: who would win?

Set (Riordan) favored — Slight edge (~55%)

Set (Riordan) · Percy Jackson · Base

Tier

HIGH 6-B, up to HIGH 6-A

Attack Potency

Large Country Level, up to Multi-Continent Level

Speed

High Hypersonic+

Durability

Large Country Level, up to Multi-Continent Level

Miao Ying · Warhammer Fantasy · Base

Tier

HIGH 6-B

Attack Potency

Island Level, up to Large Country Level

Speed

Supersonic, up to Massively Hypersonic

Durability

Large Country Level

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