Guts vs Flying Dragon Agheel: who would win?

Flying Dragon Agheel favored — Slight edge (~55%)

Guts · Berserk · Black Swordsman

Tier
8-A
Attack Potency
Multi-City Block Level
Speed
Hypersonic, up to Massively Hypersonic+
Durability
Multi-City Block Level

Flying Dragon Agheel · Elden Ring · Base

Tier
8-B, up to LOW 7-C
Attack Potency
Town Level
Speed
Transonic
Durability
Town Level

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