Zone Cops vs Eight: who would win?

Eight favored — Slight edge (~55%)

Zone Cops · Sonic · Base

Tier
2-C, up to 1-C
Attack Potency
Unknown
Speed
Infinite, up to Immeasurable
Durability
Unknown

Eight · Dragon Quest · End of Game/Postgame

Tier
LOW 2-C, up to 2-C
Attack Potency
Universe Level+, up to Low Multiverse Level
Speed
Immeasurable
Durability
Universe Level+, up to Low Multiverse Level

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