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
Spectacle hack-and-slash where reflexes and combo flow drive every fight.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
God of War III leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
God of War III leans a little harder on execution, though the gap is small.
God of War III
Combo execution and QTE timing carry combat.
Half-Life 2
Gravity gun and shooting demand precision.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
God of War III
Bosses fully scripted spectacle.
Half-Life 2
Combine AI scripted, non-adaptive.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
God of War III
Almost no randomness.
Half-Life 2
Almost no randomness.
God of War III leans a little harder on optimization, though the gap is small.
God of War III
Upgrade paths short and obvious.
Half-Life 2
Linear progression with no builds.
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.