head to head
Neither is simply harder - they are hard in different places. Call to Power II demands more reads; The Elder Scrolls V: Skyrim demands more execution.

Optimization · Pure Optimization
A turn-based 4X strategy game about optimizing civilization growth and tech trees over centuries.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Call to Power II leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans clearly harder on execution.
Call to Power II
none, purely turn-based decisions
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
Call to Power II leans clearly harder on reads.
Call to Power II
limited prediction of AI civ behavior
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
Call to Power II leans a little harder on variance, though the gap is small.
Call to Power II
random events and combat outcome rolls
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Call to Power II leans clearly harder on optimization.
Call to Power II
deep civilization-building and tech optimization
The Elder Scrolls V: Skyrim
Skill stacking, enchant loops, and exploits are deeply 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.