Kamen Rider Imperer vs Katsuya Serizawa: who would win?

Katsuya Serizawa favored — Slight edge (~55%)

Kamen Rider Imperer · Kamen Rider · Kamen Rider Imperer

Tier

HIGH 7-C

Attack Potency

Large Town Level

Speed

Superhuman, up to Supersonic

Durability

Large Town Level

Katsuya Serizawa · Mob Psycho 100 · Base

Tier

7-C

Attack Potency

Town Level+

Speed

Massively Hypersonic

Durability

Town Level+, up to Small Country Level

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