Ariu Mikaboshi vs Spamton G. Spamton: who would win?

Spamton G. Spamton 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

Spamton G. Spamton · Undertale · Spamton NEO

Tier
7-B
Attack Potency
City Level
Speed
Ftl
Durability
Multi-City Block Level, up to Multi-City Block Level+

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