Theodosia Electra vs Kei Uzuki: who would win?

Kei Uzuki favored — Slight edge (~55%)

Theodosia Electra · Toaru Majutsu no Index · Base

Tier
8-B
Attack Potency
City Block Level
Speed
Average Human
Durability
Human Level

Kei Uzuki · Sakamoto Days · Current

Tier
HIGH 8-C
Attack Potency
Large Building Level
Speed
Hypersonic+
Durability
Large Building Level

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