head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Optimization · Pure Optimization
A wave-defense RTS testing economic and defensive optimization against scripted hordes.

Optimization · Pure Optimization
Designing and optimizing a theme park's layout, pricing, and guest flow to maximize satisfaction and profit.
Diplomacy is Not an Option leans Optimization (Pure Optimization); Planet Coaster 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.
Diplomacy is Not an Option
Fast unit micro helps but isn't the ceiling
Planet Coaster
Precise track and scenery placement rewards manual dexterity
Diplomacy is Not an Option leans a little harder on reads, though the gap is small.
Diplomacy is Not an Option
Enemy hordes follow scripted waves, not adapting
Planet Coaster
No adaptive opponent; guests follow scripted happiness rules
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Diplomacy is Not an Option
Some map and event variation, mostly fixed
Planet Coaster
Guest mood noise is low and quickly mappable
Diplomacy is Not an Option leans a little harder on optimization, though the gap is small.
Diplomacy is Not an Option
Economy, defenses and army composition against scaling waves
Planet Coaster
Queue routing, pricing, and ride placement are the solvable core
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.