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

Optimization · Pure Optimization
An open sandbox where mastering crafting and building systems dominates over any physical skill.

Optimization · Pure Optimization
A first-person farming game about wrangling adorable slimes for plorts.
Minecraft: Java Edition 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.
Minecraft: Java Edition
barely relevant, building/PvP negligible for most
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.
Minecraft: Java Edition
no adaptive opponent, sandbox play
Slime Rancher
Slimes follow scripted behaviors.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Minecraft: Java Edition
world gen and mob spawns randomized
Slime Rancher
Plort prices and slime spawns vary.
Minecraft: Java Edition leans a little harder on optimization, though the gap is small.
Minecraft: Java Edition
redstone, base/resource routing solvable systems
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.