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 · Practiced Mastery
A grimy camcorder-styled shooter dragging two criminals across Shanghai.
Half-Life 2 leans Execution (Pure Mechanics); Kane & Lynch 2: Dog Days leans Execution (Practiced Mastery).
Half-Life 2 leans a little harder on execution, though the gap is small.
Half-Life 2
Gravity gun and shooting demand precision.
Kane & Lynch 2: Dog Days
Scrappy close-range gunfights demand steady aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Combine AI scripted, non-adaptive.
Kane & Lynch 2: Dog Days
Multiplayer betrayal modes add slight human reads
Kane & Lynch 2: Dog Days leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
Kane & Lynch 2: Dog Days
Fixed encounters with chaotic feel
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Linear progression with no builds.
Kane & Lynch 2: Dog Days
Cover routes and arsenal knowledge
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.