head to head
Neither is simply harder - they are hard in different places. Portal demands more execution; Samorost 3 demands more variance.

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

Optimization · Pure Optimization
An atmospheric puzzle journey solved by observing environmental logic and musical interaction patterns.
Portal leans Optimization (Pure Optimization); Samorost 3 leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Portal
Portal placement timing modest.
Samorost 3
Gentle interaction design; no reflex or timing demands
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.
Samorost 3
Solo cosmos exploration with no opponent
Samorost 3 leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
Samorost 3
Some hidden interaction spots require exploratory clicks
Portal leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
Samorost 3
Environmental music puzzles have fixed solutions discoverable through observation
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.