head to head
Neither is simply harder - they are hard in different places. Sid Meier's Civilization III demands more variance; The Elder Scrolls V: Skyrim demands more execution.

Optimization · Pure Optimization
The 2001 Civilization entry that introduced culture, strategic resources and refined empire micromanagement.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Sid Meier's Civilization III leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans clearly harder on execution.
Sid Meier's Civilization III
No dexterity in a turn-based interface
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Sid Meier's Civilization III
AI personalities are fixed and mappable
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
Sid Meier's Civilization III leans clearly harder on variance.
Sid Meier's Civilization III
Random maps, resources and combat rolls matter early
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Sid Meier's Civilization III leans clearly harder on optimization.
Sid Meier's Civilization III
Corruption math, worker turns and culture borders reward deep 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.