head to head
Neither is simply harder - they are hard in different places. Portal 2 demands more optimization; The Wolf Among Us demands more variance.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.

Optimization · Pure Optimization
A noir Fables investigation where QTE action wraps a scripted mystery with limited genuine deduction.
Portal 2 leans Optimization (Pure Optimization); The Wolf Among Us leans Optimization (Pure Optimization).
Portal 2 leans a little harder on execution, though the gap is small.
Portal 2
Portal placement requires some precision but timing is lenient.
The Wolf Among Us
Action sequences use basic QTE with low penalty for failure
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal 2
No opponent; puzzles are static.
The Wolf Among Us
Fables inhabitants follow scripted roles with no adaptive modelling
The Wolf Among Us leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
The Wolf Among Us
Investigation choices partially obscure which evidence matters
Portal 2 leans clearly harder on optimization.
Portal 2
Solving the puzzle's logic IS the entire game.
The Wolf Among Us
Scene order and evidence collection allow minor optimisation of deduction paths
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.