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

Optimization · Practiced Mastery
A feudal-Japan open-world RPG balancing stealth routing against build progression.

Optimization · Pure Optimization
A VATS-heavy wasteland RPG won by perk and build optimization.
Assassin's Creed Shadows leans Optimization (Practiced Mastery); Fallout 3 leans Optimization (Pure Optimization).
Assassin's Creed Shadows leans a little harder on execution, though the gap is small.
Assassin's Creed Shadows
Dual protagonists reward timing, still forgiving.
Fallout 3
VATS-leaning combat, low aim demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed Shadows
Enemy AI scripted, not adaptive.
Fallout 3
Scripted enemies
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed Shadows
Loot and seasonal conditions lightly randomized.
Fallout 3
Loot rolls, SPECIAL checks
Fallout 3 leans a little harder on optimization, though the gap is small.
Assassin's Creed Shadows
Builds, gear, and stealth routes solvable.
Fallout 3
Perk and build planning carries the run
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.