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 gentle licensed racer testing basic driving lines against scripted opponents.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Cars leans Execution (Practiced Mastery); Half-Life 2 leans Execution (Pure Mechanics).
Half-Life 2 leans a little harder on execution, though the gap is small.
Cars
Forgiving kart-style driving with modest racing line demands
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.
Cars
AI racers follow rubber-band scripts; split-screen rivals barely adapt
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.
Cars
Tracks and events are fixed once seen
Half-Life 2
Almost no randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Cars
Learning racing lines and shortcuts gives most of the edge
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.