Gemini Kanon vs Ben Tennyson (Original): who would win?

Gemini Kanon favored — Slight edge (~55%)

Gemini Kanon · Saint Seiya · Poseidon Arc

Tier

4-A

Attack Potency

Multi-Solar System Level

Speed

Speed Of Light

Durability

Multi-Solar System Level

Ben Tennyson (Original) · Ben 10 · With Ascalon

Tier

4-A, up to 1-B

Attack Potency

Multi-Solar System Level, up to Hyperverse Level

Speed

Average Human, up to Immeasurable

Durability

Multi-Solar System Level

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