Dragonlord Placidusax vs Aries Shion: who would win?

Aries Shion favored — Slight edge (~55%)

Dragonlord Placidusax · Elden Ring · Base

Tier

4-A, up to 3-B

Attack Potency

Multi-Solar System Level, up to Multi-Galaxy Level

Speed

Massively Hypersonic+, up to Sub-Relativistic+

Durability

Multi-Solar System Level, up to Multi-Galaxy Level

Aries Shion · Saint Seiya · Base

Tier

4-A

Attack Potency

Multi-Solar System Level

Speed

Speed Of Light

Durability

Multi-Solar System Level

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