Sister Ivry vs Darth Vader (Soul Calibur): who would win?

Sister Ivry favored — Slight edge (~55%)

Sister Ivry · Edens Zero · Base

Tier

5-B, up to 5-A

Attack Potency

Planet Level+, up to Large Planet Level

Speed

High Hypersonic, up to Massively Hypersonic+

Durability

Planet Level+, up to Large Planet Level

Darth Vader (Soul Calibur) · Star Wars · Base

Tier

5-B, up to 4-A

Attack Potency

Planet Level, up to Multi-Solar System Level

Speed

Subsonic, up to Supersonic+

Durability

Planet Level, up to Multi-Solar System Level

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