Ritsuka Fujimaru vs James Sunderland: who would win?

Ritsuka Fujimaru favored — Slight edge (~55%)

Ritsuka Fujimaru · Nasuverse · Base

Tier
9-C, up to HIGH 6-C
Attack Potency
Street Level, up to Large Island Level
Speed
Average Human, up to Ftl
Durability
Building Level+

James Sunderland · Silent Hill · Base

Tier
9-B, up to 9-A
Attack Potency
Wall Level, up to Small Building Level
Speed
Below Average Human, up to Supersonic
Durability
Wall Level, up to Small Building Level

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