Speed Demon vs Soya Sazanami: who would win?

Speed Demon favored — Slight edge (~55%)

Speed Demon · Marvel · Base

Tier
9-A
Attack Potency
Small Building Level
Speed
Ftl
Durability
Small Building Level

Soya Sazanami · Kagurabachi · Base

Tier
9-A
Attack Potency
Small Building Level
Speed
Massively Hypersonic
Durability
Small Building Level

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