Soshiro Azami vs Acrobatic Silky: who would win?

Soshiro Azami favored — Slight edge (~55%)

Soshiro Azami · Kagurabachi · Base

Tier
9-A, up to 8-B
Attack Potency
Small Building Level, up to City Block Level
Speed
Massively Hypersonic
Durability
Small Building Level, up to City Block Level

Acrobatic Silky · Dandadan · Base

Tier
9-A
Attack Potency
Small Building Level
Speed
Superhuman
Durability
Small Building Level+

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