Omatsuri vs Kakine Teitoku: who would win?

Omatsuri favored — Slight edge (~55%)

Omatsuri · One Piece · Base

Tier

7-B

Attack Potency

City Level

Speed

Relativistic

Durability

City Level

Kakine Teitoku · Toaru Majutsu no Index · Base

Tier

7-B, up to 7-A

Attack Potency

City Level, up to Mountain Level

Speed

Massively Hypersonic, up to Speed Of Light

Durability

City Level, up to Mountain Level

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