Sparda vs Justimon: who would win?

Sparda favored — Slight edge (~55%)

Sparda · Devil May Cry · Prime

Tier
LOW 1-C
Attack Potency
Low Complex Multiverse Level
Speed
Infinite
Durability
Low Complex Multiverse Level

Justimon · Digimon · Cyberdramon X

Tier
LOW 1-C
Attack Potency
Low Complex Multiverse Level
Speed
Ftl, up to Infinite
Durability
Low Complex Multiverse Level

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