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.

Execution · Practiced Mastery
Tests cautious route planning and scavenged-resource management through hostile zones.

Execution · Practiced Mastery
The acclaimed cinematic action sequel famous for its train and collapsing-building set pieces.
Left Alive leans Execution (Practiced Mastery); Uncharted 2: Among Thieves 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.
Left Alive
Clunky shooting and stealth still demand careful manual play
Uncharted 2: Among Thieves
Set-piece gunplay and traversal under fire
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Left Alive
Enemy patrols run fixed detection scripts
Uncharted 2: Among Thieves
Campaign AI is scripted; MP adds a trace
Left Alive leans a little harder on variance, though the gap is small.
Left Alive
Patrol layouts are unknown on first approach
Uncharted 2: Among Thieves
Authored spectacle, nothing hidden
Left Alive leans a little harder on optimization, though the gap is small.
Left Alive
Crafting, routing and survivor choices reward planning over reflexes
Uncharted 2: Among Thieves
Encounter knowledge trivializes replays
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.