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

Optimization · Pure Optimization
Optimising terror combos against scripted victims to maximise a points score per level.

Optimization · Pure Optimization
A gentle turn-based system easily solved by build and gear choices.
Naughty Bear 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.
Naughty Bear
Simple melee and chase inputs with low timing demands
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.
Naughty Bear
Victim bears run scripted panic routines, never modelling you
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.
Naughty Bear
Bear patrols add mild unpredictability per attempt
South Park: The Stick of Truth
Minor damage rolls; encounters are otherwise fixed
Naughty Bear leans a little harder on optimization, though the gap is small.
Naughty Bear
Maximising scare-point combos per level is a solvable puzzle
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.