Yato vs Ariu Mikaboshi: who would win?

Yato favored — Slight edge (~55%)

Yato · Fire Emblem · Omega Yato

Tier
7-B
Attack Potency
City Level
Speed
Unknown
Durability
City Level

Ariu Mikaboshi · Kagurabachi · Base

Tier
7-B
Attack Potency
City Level
Speed
Massively Hypersonic, up to Sub-Relativistic
Durability
City Block Level, up to City Level

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