Kamen Rider Den-O vs Zen'ō: who would win?

Zen'ō favored — Slight edge (~55%)

Kamen Rider Den-O · Kamen Rider · Post-Dai Shocker Den-O

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

Ftl, up to Massively Ftl+

Durability

Complex Multiverse Level

Zen'ō · Dragon Ball · Base

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

Massively Ftl+

Durability

Complex Multiverse Level

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