Welt Yang vs Coily Rattler: who would win?

Welt Yang favored — Favored (~65%)

Welt Yang · Honkai: Star Rail · Post-Sea of Quanta

Tier

3-C, up to HIGH 1-B

Attack Potency

Galaxy Level, up to High Hyperverse Level

Speed

Ftl, up to Infinite

Durability

Galaxy Level

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

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