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

Optimization · Pure Optimization
A park management sim about engineering dinosaurs and containing the consequences.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Jurassic World Evolution leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Jurassic World Evolution
Cursor-driven building and ranger driving
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
No adaptive opponent
Portal
No adversary modeling player.
Jurassic World Evolution leans clearly harder on variance.
Jurassic World Evolution
Storms, sabotage, and genome luck intrude
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
Enclosure design, genetics, and economy are the core
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.