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 · Pure Optimization
A turn-based tactics game testing positioning and squad management under RNG.

Optimization · Systems & Chaos
Medieval dynasty sim with chaotic event-driven stories.
Arma Tactics leans Optimization (Pure Optimization); Crusader Kings II leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Arma Tactics
Turn-based - no twitch demands
Crusader Kings II
pausable, no reflex
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Arma Tactics
Enemy AI scripted; some randomized objectives but no adaptive mind
Crusader Kings II
AI characters scripted not adaptive
Crusader Kings II leans a little harder on variance, though the gap is small.
Arma Tactics
Hit chance and randomized missions add real randomness
Crusader Kings II
dynastic events, traits, intrigue
Arma Tactics leans a little harder on optimization, though the gap is small.
Arma Tactics
Positioning, cover and weapon use are the core tactics
Crusader Kings II
succession, marriages, claims plannable
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.