Yoichi Nagumo vs Solarmon: who would win?

Solarmon favored — Slight edge (~55%)

Yoichi Nagumo · Sakamoto Days · JAA/The Order

Tier
HIGH 8-C
Attack Potency
Large Building Level
Speed
Hypersonic+
Durability
Large Building Level

Solarmon · Digimon · Base

Tier
HIGH 8-C
Attack Potency
Large Building Level
Speed
Massively Hypersonic+
Durability
Large Building Level

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