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

Optimization · Pure Optimization
Directing an agent through a surveillance network by routing camera access and managing scripted guard patrols.
Fallout 3 leans Optimization (Pure Optimization); Republique leans Optimization (Pure Optimization).
Fallout 3 leans a little harder on execution, though the gap is small.
Fallout 3
VATS-leaning combat, low aim demand
Republique
Point-and-tap interface removes all twitch demand entirely
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
Republique
PRIZM guards follow patrol scripts; no adaptive opponent present
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout 3
Loot rolls, SPECIAL checks
Republique
Camera node layout is consistent; hidden items are the only fog
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
Republique
Camera network routing and item discovery sequencing are learnable
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.