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.

Execution · Practiced Mastery
A monochrome puzzle-platformer about a boy lost in limbo.

Execution · Practiced Mastery
A cinematic desert-bound adventure of shootouts, brawls, and sinking-ship set pieces.
Limbo leans Execution (Practiced Mastery); Uncharted 3: Drake's Deception leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Limbo
Tight platforming with trial-and-error.
Uncharted 3: Drake's Deception
Gunfights, melee, and chases need steady hands
Uncharted 3: Drake's Deception leans a little harder on reads, though the gap is small.
Limbo
Hazards are scripted.
Uncharted 3: Drake's Deception
Scripted enemies; multiplayer adds a trace
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Limbo
No randomness.
Uncharted 3: Drake's Deception
Linear authored adventure
Limbo leans a little harder on optimization, though the gap is small.
Limbo
Puzzles have fixed solutions.
Uncharted 3: Drake's Deception
Learning encounters and routes solves the campaign
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.