Virion vs Superman (Earth One): who would win?

Superman (Earth One) favored — Slight edge (~55%)

Virion · Fire Emblem · Base

Tier

7-B, up to 4-A

Attack Potency

City Level, up to Multi-Solar System Level

Speed

Superhuman, up to Massively Hypersonic+

Durability

City Level

Superman (Earth One) · DC · Base

Tier

7-B

Attack Potency

City Level

Speed

Massively Hypersonic

Durability

City Level

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