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

Optimization · Pure Optimization
An open-source hex strategy game famous for its luck-laced combat rolls.
Crusader Kings II leans Optimization (Systems & Chaos); The Battle for Wesnoth leans Optimization (Pure Optimization).
Crusader Kings II leans a little harder on execution, though the gap is small.
Crusader Kings II
pausable, no reflex
The Battle for Wesnoth
Turn-based hex moves, no dexterity.
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
The Battle for Wesnoth
Multiplayer opponents adapt; campaigns scripted.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Crusader Kings II
dynastic events, traits, intrigue
The Battle for Wesnoth
To-hit rolls swing battles constantly.
The Battle for Wesnoth leans a little harder on optimization, though the gap is small.
Crusader Kings II
succession, marriages, claims plannable
The Battle for Wesnoth
Unit matchups, terrain, and economy solvable.
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.