head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Optimization · Systems & Chaos
Medieval dynasty sim with chaotic event-driven stories.

Optimization · Pure Optimization
Fantasy 4X with strong asymmetric factions and quest paths.
Crusader Kings II leans Optimization (Systems & Chaos); Endless Legend 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.
Crusader Kings II
pausable, no reflex
Endless Legend
turn-based
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Crusader Kings II
AI characters scripted not adaptive
Endless Legend
scripted AI, limited MP
Crusader Kings II leans a little harder on variance, though the gap is small.
Crusader Kings II
dynastic events, traits, intrigue
Endless Legend
quest and tech rolls
Endless Legend leans a little harder on optimization, though the gap is small.
Crusader Kings II
succession, marriages, claims plannable
Endless Legend
faction-specific yield optimization
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.