Jiji vs Sauron (Lego): who would win?

Jiji favored — Slight edge (~55%)

Jiji · Dandadan · Accessing Ki

Tier
9-A, up to HIGH 8-C
Attack Potency
Small Building Level+, up to Building Level+
Speed
Superhuman
Durability
Building Level

Sauron (Lego) · Lord of the Rings · Base

Tier
8-C
Attack Potency
Wall Level, up to Building Level
Speed
Peak Human, up to Superhuman
Durability
Wall Level

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