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

Optimization · Pure Optimization
Sci-fi thriller played as the station AI solving its own crisis.

Optimization · Systems & Chaos
A casual zoo management sim about building exhibits and keeping visitors happy.
Observation leans Optimization (Pure Optimization); Zoo Park leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Observation
Camera control and interface manipulation
Zoo Park
minimal input skill, simple clicking
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Observation
Events are fully authored
Zoo Park
no adaptive opponent, solo park sim
Zoo Park leans a little harder on variance, though the gap is small.
Observation
Mystery unknown until uncovered
Zoo Park
random visitor/animal events
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Observation
Systems puzzles and station schematics solving
Zoo Park
economy and layout management dominate
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.