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

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

Optimization · Pure Optimization
A real-time dungeon crawler mixing light combat reflexes with puzzle and inventory mastery.
Fallout 3 leans Optimization (Pure Optimization); Lands of Lore: The Throne of Chaos 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
Lands of Lore: The Throne of Chaos
Real-time clicking and dodge-stepping in corridors.
Fallout 3 leans a little harder on reads, though the gap is small.
Fallout 3
Scripted enemies
Lands of Lore: The Throne of Chaos
Monsters charge on simple scripts.
Lands of Lore: The Throne of Chaos leans a little harder on variance, though the gap is small.
Fallout 3
Loot rolls, SPECIAL checks
Lands of Lore: The Throne of Chaos
Hidden switches, traps, and item rolls.
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
Lands of Lore: The Throne of Chaos
Inventory, leveling, and dungeon routing carry progress.
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.