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
Cozy space exploration and base-building sandbox.

Optimization · Pure Optimization
A first-person farming game about wrangling adorable slimes for plorts.
Astroneer leans Optimization (Pure Optimization); Slime Rancher 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.
Astroneer
Light terrain tool inputs
Slime Rancher
Vacuum aiming is gentle.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Astroneer
No adaptive opponents
Slime Rancher
Slimes follow scripted behaviors.
Slime Rancher leans a little harder on variance, though the gap is small.
Astroneer
Planet resource distribution
Slime Rancher
Plort prices and slime spawns vary.
Astroneer leans a little harder on optimization, though the gap is small.
Astroneer
Base layout, power chains, automation
Slime Rancher
Ranch layout and economy reward planning.
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.