Kihara Noukan vs U-8: who would win?

Kihara Noukan favored — Slight edge (~55%)

Kihara Noukan · Toaru Majutsu no Index · Base

Tier

9-A, up to 5-B

Attack Potency

Small Building Level, up to Planet Level

Speed

Peak Human, up to High Hypersonic

Durability

City Level

U-8 · Resident Evil · Base

Tier

9-A

Attack Potency

Small Building Level

Speed

Superhuman, up to Supersonic

Durability

Large Building Level

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