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.

Execution · Practiced Mastery
A low-ceiling corridor shooter whose broken AI undercuts every skill test.

Execution · Practiced Mastery
A retro-Soviet action shooter mixing gunplay with light upgrade strategy.
Aliens: Colonial Marines leans Execution (Practiced Mastery); Atomic Heart leans Execution (Practiced Mastery).
Atomic Heart leans a little harder on execution, though the gap is small.
Aliens: Colonial Marines
Standard shooter aim against infamously dumb xenomorphs
Atomic Heart
Shooting and dodging carry the combat.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Aliens: Colonial Marines
Broken AI barely follows its own scripts
Atomic Heart
Robot enemies follow scripted patterns.
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
Atomic Heart
Encounters largely fixed.
Atomic Heart leans a little harder on optimization, though the gap is small.
Aliens: Colonial Marines
Loadout choices barely matter against weak opposition
Atomic Heart
Upgrades and weapon crafting 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.