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
An open-world sandbox solved through creative build optimization and routing.
Portal leans Optimization (Pure Optimization); The Legend of Zelda: Tears of the Kingdom 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.
The Legend of Zelda: Tears of the Kingdom
Combat and traversal need modest timing
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.
The Legend of Zelda: Tears of the Kingdom
World is fixed, nothing adapts
The Legend of Zelda: Tears of the Kingdom leans a little harder on variance, though the gap is small.
Portal
Deterministic chambers; no randomness.
The Legend of Zelda: Tears of the Kingdom
Weapon durability adds light variance
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Portal
Pure puzzle-solving optimization.
The Legend of Zelda: Tears of the Kingdom
Build contraptions and route the open world
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.