head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, and it is a single point.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.

Optimization · Pure Optimization
Zelda-starring adventure where summoning copied objects and monsters solves combat and puzzles alike.
The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization); The Legend of Zelda: Echoes of Wisdom leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
The Legend of Zelda: Echoes of Wisdom
Light action; echoes fight for you
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
The Legend of Zelda: Echoes of Wisdom
Scripted enemies throughout
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
The Legend of Zelda: Echoes of Wisdom
First-run discovery of echoes and rifts
The Legend of Zelda: Echoes of Wisdom leans a little harder on optimization, though the gap is small.
The Elder Scrolls V: Skyrim
Skill stacking, enchant loops, and exploits are deeply solvable.
The Legend of Zelda: Echoes of Wisdom
Choosing which copied object solves each room
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.