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

Optimization · Pure Optimization
A VATS-heavy wasteland RPG won by perk and build optimization.

Optimization · Pure Optimization
An open-world RPG whose min-maxable leveling and build system dominate over its clunky combat.
Fallout 3 leans Optimization (Pure Optimization); The Elder Scrolls IV: Oblivion Remastered 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.
Fallout 3
VATS-leaning combat, low aim demand
The Elder Scrolls IV: Oblivion Remastered
real-time combat but forgiving swings
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout 3
Scripted enemies
The Elder Scrolls IV: Oblivion Remastered
NPCs follow scripted AI packages
Fallout 3 leans a little harder on variance, though the gap is small.
Fallout 3
Loot rolls, SPECIAL checks
The Elder Scrolls IV: Oblivion Remastered
loot/leveling has some randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout 3
Perk and build planning carries the run
The Elder Scrolls IV: Oblivion Remastered
leveling system, builds min-maxable
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.