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

Optimization · Pure Optimization
Pre-solving battles through ship design and deployment, then watching the answer play out.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Gratuitous Space Battles leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans clearly harder on execution.
Gratuitous Space Battles
Battles run hands-off once deployed
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
Gratuitous Space Battles leans a little harder on reads, though the gap is small.
Gratuitous Space Battles
Async challenges exist but fleets cannot adapt mid-fight
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
Gratuitous Space Battles leans a little harder on variance, though the gap is small.
Gratuitous Space Battles
Unknown enemy loadouts add pre-battle hidden information
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Gratuitous Space Battles leans clearly harder on optimization.
Gratuitous Space Battles
Ship design and deployment orders decide everything before combat starts
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.