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
A dinosaur park builder balancing visitor profit against inevitable raptor breakouts.

Optimization · Pure Optimization
Lane defense classic about managing a sun economy against shambling waves.
Jurassic Park: Operation Genesis leans Optimization (Pure Optimization); Plants vs. Zombies 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 Park: Operation Genesis
Menu-driven park management
Plants vs. Zombies
Clicking to plant, minimal pressure
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Jurassic Park: Operation Genesis
No adaptive opposition
Plants vs. Zombies
Zombie waves follow set compositions
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Jurassic Park: Operation Genesis
Twisters, breakouts, and dig-site luck disrupt plans
Plants vs. Zombies
Wave timing and lane pressure vary mildly
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Jurassic Park: Operation Genesis
Park layout, finances, and dino-need balancing
Plants vs. Zombies
Sun economy and lane setups are near-solvable
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.