Apart vs Acrobatic Silky: who would win?

Apart favored — Slight edge (~55%)

Apart · Sakamoto Days · Base

Tier
9-A
Attack Potency
Small Building Level
Speed
Supersonic
Durability
Building 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.