Magent Magent vs Itsuwa: who would win?

Itsuwa favored — Slight edge (~55%)

Magent Magent · JoJo's Bizarre Adventure · Base

Tier

9-C, up to 8-C

Attack Potency

Street Level, up to Building Level+

Speed

Immobile, up to Massively Ftl

Durability

Building Level+

Itsuwa · Toaru Majutsu no Index · Base

Tier

9-C, up to 8-B

Attack Potency

Street Level, up to City Block Level

Speed

Peak Human, up to Supersonic

Durability

City Block Level

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