Kamen Rider Zi-O (Over Quartzer) vs Shiki Ryougi (Saber): who would win?

Kamen Rider Zi-O (Over Quartzer) favored — Favored (~65%)

Kamen Rider Zi-O (Over Quartzer) · Kamen Rider · Kamen Rider Zi-O

Tier
1-A, up to HIGH 1-A
Attack Potency
Outerverse Level, up to High Outerverse Level
Speed
Immeasurable
Durability
Outerverse Level, up to High Outerverse Level

Shiki Ryougi (Saber) · Nasuverse · Base

Tier
1-A
Attack Potency
Outerverse Level
Speed
Relativistic+, up to Immeasurable
Durability
Large Island Level

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