Jörmungandr (Toaru) vs The Sorrow: who would win?

Too close to call

Jörmungandr (Toaru) · Toaru Majutsu no Index · Base

Tier: 8-B
Attack Potency: City Block Level
Speed: Subsonic
Durability: Unknown

The Sorrow · Metal Gear · Base

Tier: 8-B
Attack Potency: City Block Level
Speed: Superhuman, up to Massively Hypersonic
Durability: Unknown

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