head to head
Valheim asks more than Minecraft: Java Edition, and the gap is execution.

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

Optimization · Pure Optimization
A Viking survival game where preparing properly trivialises each biome boss.
Minecraft: Java Edition leans Optimization (Pure Optimization); Valheim leans Optimization (Pure Optimization).
Valheim leans clearly harder on execution.
Minecraft: Java Edition
barely relevant, building/PvP negligible for most
Valheim
Block-and-parry timing matters in boss fights.
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
Valheim
Enemies follow scripted AI; no adaptation.
Minecraft: Java Edition leans a little harder on variance, though the gap is small.
Minecraft: Java Edition
world gen and mob spawns randomized
Valheim
World seed and biome layout introduce mild randomness.
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
Valheim
Gear progression and base infrastructure define progress.
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.