head to head
Neither is simply harder - they are hard in different places. Pokémon Alpha Sapphire demands more variance; The Elder Scrolls V: Skyrim demands more execution.

Optimization · Pure Optimization
Solvable type-matchup and team-building math across a scripted adventure.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Pokémon Alpha Sapphire leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans clearly harder on execution.
Pokémon Alpha Sapphire
Turn-based menus, zero physical ceiling
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
Pokémon Alpha Sapphire leans a little harder on reads, though the gap is small.
Pokémon Alpha Sapphire
Campaign trainers are scripted; PvP is optional endgame
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
Pokémon Alpha Sapphire leans clearly harder on variance.
Pokémon Alpha Sapphire
Encounters, abilities and catch rolls add mappable RNG
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon Alpha Sapphire
Type math, breeding and team building are the core
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.