Coily Rattler vs Bookworm: who would win?

Bookworm favored — Slight edge (~55%)

Coily Rattler · Kirby · Base

Tier

4-A

Attack Potency

Multi-Solar System Level

Speed

Massively Ftl+

Durability

Multi-Solar System Level, up to Low Multiverse Level

Bookworm · My Little Pony · Inside the Story World

Tier

4-A

Attack Potency

Multi-Solar System Level

Speed

Infinite

Durability

Multi-Solar System Level

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