Vecna vs Flash (Barry Allen) (Post-Crisis): who would win?

Vecna favored — Slight edge (~55%)

Vecna · Dungeons & Dragons · Greater God and boosted By The Serpent

Tier

2-A

Attack Potency

Multiverse Level+

Speed

Infinite

Durability

Multiverse Level+

Flash (Barry Allen) (Post-Crisis) · DC · Base

Tier

2-A, up to HIGH 1-A

Attack Potency

Multiverse Level+, up to High Outerverse Level

Speed

Massively Ftl+, up to Immeasurable

Durability

Multiverse Level+, up to High Outerverse Level

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