Tsuchimikado Motoharu vs Acrobatic Silky: who would win?

Too close to call

Tsuchimikado Motoharu · Toaru Majutsu no Index · Base

Tier
9-A
Attack Potency
Small Building Level
Speed
Peak Human, up to Subsonic
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.