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
Grim space colony sim about keeping a generation-ship station from collapsing.

Optimization · Pure Optimization
A farm-life sim solved by season routing and profit optimization.
IXION leans Optimization (Pure Optimization); Stardew Valley leans Optimization (Pure Optimization).
Stardew Valley leans a little harder on execution, though the gap is small.
IXION
Pause-friendly station management
Stardew Valley
Trivial timing on fishing and combat
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
IXION
Events follow story scripts
Stardew Valley
No adaptive opponent exists
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
IXION
System events and exploration outcomes vary
Stardew Valley
Crop luck and geode RNG matter modestly
IXION leans a little harder on optimization, though the gap is small.
IXION
Hull sectors, power, and population logistics dominate
Stardew Valley
Routing seasons, profit loops, and bundles dominates
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.