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 low-ceiling corridor shooter whose broken AI undercuts every skill test.

Execution · Practiced Mastery
A short graphics showcase testing basic shooter execution for twenty minutes.
Aliens: Colonial Marines leans Execution (Practiced Mastery); Half-Life 2: Lost Coast 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.
Aliens: Colonial Marines
Standard shooter aim against infamously dumb xenomorphs
Half-Life 2: Lost Coast
A short stretch of standard Half-Life 2 gunplay
Aliens: Colonial Marines leans a little harder on reads, though the gap is small.
Aliens: Colonial Marines
Broken AI barely follows its own scripts
Half-Life 2: Lost Coast
A handful of scripted Combine soldiers
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Aliens: Colonial Marines
Encounters are fixed and trivially learnable
Half-Life 2: Lost Coast
One fixed level with nothing hidden
Aliens: Colonial Marines leans a little harder on optimization, though the gap is small.
Aliens: Colonial Marines
Loadout choices barely matter against weak opposition
Half-Life 2: Lost Coast
Too brief to develop any systems layer
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.