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

Optimization · Pure Optimization
The archetypal idle game where optimal purchase order is the entire skill.

Optimization · Pure Optimization
The beloved theme park builder where you design coasters and manage every detail of a growing park.
Cookie Clicker leans Optimization (Pure Optimization); RollerCoaster Tycoon leans Optimization (Pure Optimization).
RollerCoaster Tycoon leans a little harder on execution, though the gap is small.
Cookie Clicker
Clicking is optional past the early game
RollerCoaster Tycoon
Mouse-driven building with no time pressure
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Cookie Clicker
No opponent
RollerCoaster Tycoon
Guests are simple, fully mappable simulations
Cookie Clicker leans a little harder on variance, though the gap is small.
Cookie Clicker
Golden cookie timing randomness
RollerCoaster Tycoon
Guest spawns and breakdowns barely matter
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Cookie Clicker
Purchase order and ascension math are the game
RollerCoaster Tycoon
Park layout, pricing, and coaster stats are solvable systems
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.