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 · Pure Mechanics
VR Half-Life where hand-presence interaction defines every fight.

Execution · Pure Mechanics
A light-gun shooter testing aim while protecting a moving medic.
Half-Life: Alyx leans Execution (Pure Mechanics); Rescue Mission leans Execution (Pure Mechanics).
Rescue Mission leans a little harder on execution, though the gap is small.
Half-Life: Alyx
VR aim, reload, and grab inputs intense.
Rescue Mission
Light-gun aiming accuracy is the entire game
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life: Alyx
Combine and headcrabs scripted.
Rescue Mission
Enemy soldiers spawn on scripts, not adaptively
Rescue Mission leans a little harder on variance, though the gap is small.
Half-Life: Alyx
Resource and encounter variance light.
Rescue Mission
Enemy appearance timing adds some unpredictability
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life: Alyx
Few systems to tune.
Rescue Mission
Prioritizing threats offers light tactics
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.