Treyni (Web Novel) vs Setne: who would win?

Setne favored — Slight edge (~55%)

Treyni (Web Novel) · Tensei Shitara Slime Datta Ken · Base

Tier

7-B, up to 6-A

Attack Potency

City Level, up to Continent Level

Speed

Transonic, up to Massively Hypersonic

Durability

City Level, up to Continent Level

Setne · Percy Jackson · Base

Tier

7-B, up to 5-B

Attack Potency

City Level, up to Planet Level

Speed

High Hypersonic+

Durability

City Level

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