head to head
Neither is simply harder - they are hard in different places. Dyson Sphere Program demands more optimization; The Elder Scrolls V: Skyrim demands more execution.

Optimization · Pure Optimization
Solving an interstellar logistics and power-engineering puzzle to construct a Dyson Sphere.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Dyson Sphere Program leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans clearly harder on execution.
Dyson Sphere Program
All input is construction clicks with no combat ceiling
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.
Dyson Sphere Program
No adversary exists in the default game mode
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dyson Sphere Program
Star system layouts vary per seed but are fully mappable
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Dyson Sphere Program leans clearly harder on optimization.
Dyson Sphere Program
Interstellar logistics and sphere construction are a pure engineering optimisation problem
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.