head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Optimization · Practiced Mastery
An accessible action RPG of moral choices, property empires, and a loyal dog.

Optimization · Pure Optimization
A gentle turn-based system easily solved by build and gear choices.
Fable II leans Optimization (Practiced Mastery); South Park: The Stick of Truth leans Optimization (Pure Optimization).
Fable II leans a little harder on execution, though the gap is small.
Fable II
One-button combat, forgiving by design
South Park: The Stick of Truth
Timed attack and block prompts add light input demands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fable II
Scripted opposition
South Park: The Stick of Truth
Enemies follow fixed turn-based scripts
South Park: The Stick of Truth leans a little harder on variance, though the gap is small.
Fable II
Fixed world with minor loot rolls
South Park: The Stick of Truth
Minor damage rolls; encounters are otherwise fixed
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fable II
Property empire and job economy trivially exploitable
South Park: The Stick of Truth
Build, gear and ability choices comfortably solve every fight
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.