Thor (Toaru) vs Jason (Fortnite): who would win?

Thor (Toaru) favored — Slight edge (~55%)

Thor (Toaru) · Toaru Majutsu no Index · Base

Tier

9-A, up to 6-A

Attack Potency

Small Building Level, up to Continent Level

Speed

Sub-Relativistic

Durability

Small Building Level, up to Country Level

Jason (Fortnite) · Fortnite · Base

Tier

9-A

Attack Potency

Small Building Level+

Speed

Average Human, up to Supersonic+

Durability

Small Building Level+, up to Building Level

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