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 · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.

Execution · Practiced Mastery
Pointer accuracy against memorized enemy spawns on fixed rails.
Half-Life 2 leans Execution (Pure Mechanics); Resident Evil: The Darkside Chronicles 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.
Half-Life 2
Gravity gun and shooting demand precision.
Resident Evil: The Darkside Chronicles
Pointer accuracy on weak points is the whole input
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Resident Evil: The Darkside Chronicles
Zombies arrive on a fixed rail script
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Almost no randomness.
Resident Evil: The Darkside Chronicles
Spawns repeat identically every playthrough
Resident Evil: The Darkside Chronicles leans a little harder on optimization, though the gap is small.
Half-Life 2
Linear progression with no builds.
Resident Evil: The Darkside Chronicles
Weapon upgrades and memorized spawn order raise scores
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.