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
Designing and optimizing a theme park's layout, pricing, and guest flow to maximize satisfaction and profit.

Optimization · Pure Optimization
A grid dungeon crawler testing build choices, puzzle-solving and enemy-type counterplay.
Planet Coaster leans Optimization (Pure Optimization); Vaporum 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.
Planet Coaster
Precise track and scenery placement rewards manual dexterity
Vaporum
Real-time grid-dancing around enemies needs some timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Planet Coaster
No adaptive opponent; guests follow scripted happiness rules
Vaporum
Enemies follow fixed behaviours per type
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Planet Coaster
Guest mood noise is low and quickly mappable
Vaporum
Dungeon is authored; loot mostly placed
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Planet Coaster
Queue routing, pricing, and ride placement are the solvable core
Vaporum
Gear loadouts, rig builds and puzzle solutions are the 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.