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

Optimization · Pure Optimization
A refined break-and-boost JRPG won by job and latent-power optimization.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Octopath Traveler II leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans clearly harder on execution.
Octopath Traveler II
Turn-based, no input demand
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
Octopath Traveler II leans a little harder on reads, though the gap is small.
Octopath Traveler II
Scripted enemies
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
Octopath Traveler II leans a little harder on variance, though the gap is small.
Octopath Traveler II
Hit, crit, and break rolls
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Octopath Traveler II leans clearly harder on optimization.
Octopath Traveler II
Job, latent power, party routing deeply rewarded
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.