head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

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

Optimization · Pure Optimization
A farm-life sim solved by season routing and profit optimization.
Jurassic World Evolution 2 leans Optimization (Pure Optimization); Stardew Valley 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.
Jurassic World Evolution 2
Building and capture minigames, low pressure
Stardew Valley
Trivial timing on fishing and combat
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
Stardew Valley
No adaptive opponent exists
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Jurassic World Evolution 2
Weather disasters and dino temperament surprises
Stardew Valley
Crop luck and geode RNG matter modestly
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
Stardew Valley
Routing seasons, profit loops, and bundles dominates
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.