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
A first-person puzzle game about solving surreal dream-logic challenges.
Portal leans Optimization (Pure Optimization); Suicide Guy 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.
Suicide Guy
Some platforming, but timing rarely strict
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.
Suicide Guy
Solo dream puzzles, no adversary
Suicide Guy leans a little harder on variance, though the gap is small.
Portal
Deterministic chambers; no randomness.
Suicide Guy
Puzzle setups are fixed, nothing random
Portal leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
Suicide Guy
Figuring out each dream's puzzle solution is the game
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.