Ariu Mikaboshi vs Accelerator: who would win?

Ariu Mikaboshi favored — Slight edge (~55%)

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

Accelerator · Toaru Majutsu no Index · Pre-Headshot

Tier
7-B, up to HIGH 6-A
Attack Potency
City Level, up to Multi-Continent Level
Speed
Massively Hypersonic
Durability
Wall Level

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