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
Testing how precisely you can swing a Move controller across six sports.
Half-Life 2 leans Execution (Pure Mechanics); Sports Champions 2 leans Execution (Pure Mechanics).
Sports Champions 2 leans a little harder on execution, though the gap is small.
Half-Life 2
Gravity gun and shooting demand precision.
Sports Champions 2
Motion-controlled swings and punches reward physical precision
Sports Champions 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Sports Champions 2
Local rivals can be baited in boxing or tennis, lightly
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Almost no randomness.
Sports Champions 2
Events are deterministic given your motion
Half-Life 2 leans a little harder on optimization, though the gap is small.
Half-Life 2
Linear progression with no builds.
Sports Champions 2
Technique tips exist but systems stay shallow
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.