Mugino Shizuri vs Isaac Netero: who would win?

Isaac Netero favored — Slight edge (~55%)

Mugino Shizuri · Toaru Majutsu no Index · Base

Tier

8-A, up to 7-C

Attack Potency

Multi-City Block Level+, up to Town Level

Speed

Athletic Human, up to High Hypersonic+

Durability

Multi-City Block Level+, up to Town Level

Isaac Netero · Hunter x Hunter · Prime

Tier

8-A, up to LOW 7-B

Attack Potency

Multi-City Block Level, up to Small City Level

Speed

Massively Hypersonic

Durability

Multi-City Block Level+, up to Small Town Level

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