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

Optimization · Pure Optimization
Scheduling scarce time and resources across a base run by copies of yourself.
Minecraft: Java Edition leans Optimization (Pure Optimization); The Alters leans Optimization (Pure Optimization).
Minecraft: Java Edition leans a little harder on execution, though the gap is small.
Minecraft: Java Edition
barely relevant, building/PvP negligible for most
The Alters
Third-person walking and menus, no twitch demands
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
The Alters
No adaptive opponent, only systems and story beats
The Alters leans a little harder on variance, though the gap is small.
Minecraft: Java Edition
world gen and mob spawns randomized
The Alters
Unscouted events and alter reactions surprise first runs
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Minecraft: Java Edition
redstone, base/resource routing solvable systems
The Alters
Time, resource and crew scheduling under deadlines is the game
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.