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

Optimization · Pure Optimization
An open-source hex strategy game famous for its luck-laced combat rolls.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
The Battle for Wesnoth leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans clearly harder on execution.
The Battle for Wesnoth
Turn-based hex moves, no dexterity.
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
The Battle for Wesnoth leans clearly harder on reads.
The Battle for Wesnoth
Multiplayer opponents adapt; campaigns scripted.
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
The Battle for Wesnoth leans clearly harder on variance.
The Battle for Wesnoth
To-hit rolls swing battles constantly.
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
The Battle for Wesnoth leans a little harder on optimization, though the gap is small.
The Battle for Wesnoth
Unit matchups, terrain, and economy solvable.
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.