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
Landmark FPS built on physics puzzles and tight gunplay.

Execution · Pure Mechanics
Reflex-timed throwing accuracy and ball economy along an accelerating rail.
Half-Life 2 leans Execution (Pure Mechanics); Smash Hit leans Execution (Pure Mechanics).
Smash Hit leans a little harder on execution, though the gap is small.
Half-Life 2
Gravity gun and shooting demand precision.
Smash Hit
Timed taps to break glass before impact decide survival
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Smash Hit
No opponent - obstacles are preset courses
Smash Hit leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
Smash Hit
Minor obstacle shuffling, quickly familiar with replays
Smash Hit leans a little harder on optimization, though the gap is small.
Half-Life 2
Linear progression with no builds.
Smash Hit
Ball conservation and multiball management extend runs
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.