Zephyro vs Shion (Web Novel): who would win?

Shion (Web Novel) favored — Favored (~65%)

Zephyro · Honkai: Star Rail · Base

Tier

3-B, up to 2-A

Attack Potency

Multi-Galaxy Level, up to Multiverse Level+

Speed

Massively Ftl+, up to Infinite

Durability

Multi-Galaxy Level

Shion (Web Novel) · Tensei Shitara Slime Datta Ken · Afterstories

Tier

3-A

Attack Potency

Universe Level

Speed

Transonic, up to Massively Ftl+

Durability

Universe Level

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