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 small-plot city builder where specialization economics and traffic engineering decide success.
IXION leans Optimization (Pure Optimization); SimCity (2013) leans Optimization (Pure Optimization).
SimCity (2013) leans a little harder on execution, though the gap is small.
IXION
Pause-friendly station management
SimCity (2013)
Mouse planning; no dexterity demands.
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
SimCity (2013)
No opponent; multiplayer regions cooperate.
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
SimCity (2013)
Agent simulation quirks behave unpredictably.
IXION leans a little harder on optimization, though the gap is small.
IXION
Hull sectors, power, and population logistics dominate
SimCity (2013)
Specialization chains and traffic layouts reward systematic 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.