head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Pure Optimization
Hunting each level's optimal slingshot solution under mild physics noise.

Optimization · Pure Optimization
A gentle turn-based system easily solved by build and gear choices.
Angry Birds Star Wars leans Optimization (Pure Optimization); South Park: The Stick of Truth leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Angry Birds Star Wars
Slingshot aim needs only mild touch precision
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.
Angry Birds Star Wars
Pigs sit motionless awaiting demolition
South Park: The Stick of Truth
Enemies follow fixed turn-based scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Angry Birds Star Wars
Physics tumbles add slight outcome noise per shot
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.
Angry Birds Star Wars
Finding each level's three-star shot solution is the game
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.