head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Pure Optimization
Cozy castle-builder with optimization-friendly layouts.

Optimization · Pure Optimization
A small-plot city builder where specialization economics and traffic engineering decide success.
Kingdoms and Castles leans Optimization (Pure Optimization); SimCity (2013) 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.
Kingdoms and Castles
no reflex
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.
Kingdoms and Castles
scripted viking raids
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.
Kingdoms and Castles
raid and disaster timing
SimCity (2013)
Agent simulation quirks behave unpredictably.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Kingdoms and Castles
layouts, taxes, defenses
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.