head to head
Neither is simply harder - they are hard in different places. Jurassic World Evolution 2 demands more variance; Portal demands more execution.

Optimization · Pure Optimization
The expanded dinosaur park sim adding aviaries, lagoons, and chaos-theory scenarios.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Jurassic World Evolution 2 leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Jurassic World Evolution 2
Building and capture minigames, low pressure
Portal
Portal placement timing modest.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Jurassic World Evolution 2
No adaptive opponent
Portal
No adversary modeling player.
Jurassic World Evolution 2 leans clearly harder on variance.
Jurassic World Evolution 2
Weather disasters and dino temperament surprises
Portal
Deterministic chambers; no randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Jurassic World Evolution 2
Territory, welfare, and scientist logistics optimisation
Portal
Pure puzzle-solving optimization.
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.