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

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.

Optimization · Pure Optimization
Gorgeous co-op puzzle-platforming where the cleverest contraption wins, not the fastest fingers.
Portal leans Optimization (Pure Optimization); Trine 2 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.
Portal
Portal placement timing modest.
Trine 2
Rope swings and box physics demand moderate dexterity
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal
No adversary modeling player.
Trine 2
Static puzzles, no adaptive opposition
Trine 2 leans a little harder on variance, though the gap is small.
Portal
Deterministic chambers; no randomness.
Trine 2
Everything is visible and deterministic
Portal leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
Trine 2
Hero-swap puzzle solving is the central test
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.