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 · Practiced Mastery
A PSP stealth-action side story following Altair's hunt for Templars on Cyprus.

Optimization · Practiced Mastery
Open-world Hyrule built on physics puzzles and exploration over reflex tests.
Assassin's Creed: Bloodlines leans Optimization (Practiced Mastery); The Legend of Zelda: Breath of the Wild leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed: Bloodlines
Simplified PSP combat and climbing demand little precision
The Legend of Zelda: Breath of the Wild
Parry timing and aiming matter but forgiving.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed: Bloodlines
Templar guards are entirely scripted
The Legend of Zelda: Breath of the Wild
Enemies follow fixed scripted behaviors.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed: Bloodlines
Compact fixed maps leave few surprises
The Legend of Zelda: Breath of the Wild
Weapon drops and weather lightly randomized.
The Legend of Zelda: Breath of the Wild leans a little harder on optimization, though the gap is small.
Assassin's Creed: Bloodlines
Route knowledge and counter timing are quickly solved
The Legend of Zelda: Breath of the Wild
Shrines, cooking, traversal routes fully 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.