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
An open-world winter sports game testing trick execution and downhill control.
Half-Life 2 leans Execution (Pure Mechanics); Snow leans Execution (Pure Mechanics).
Snow leans a little harder on execution, though the gap is small.
Half-Life 2
Gravity gun and shooting demand precision.
Snow
Controlling tricks, balance and landings is the lead skill
Snow leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Snow
Open-world solo play with no adaptive opponent
Snow leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
Snow
Terrain is fixed; minor randomness in events
Snow leans a little harder on optimization, though the gap is small.
Half-Life 2
Linear progression with no builds.
Snow
Line choice and gear tuning reward planning for events
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.