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 short graphics showcase testing basic shooter execution for twenty minutes.

Execution · Pure Mechanics
Flailing accurately at motion-tracked minigames, nothing deeper.
Half-Life 2: Lost Coast leans Execution (Practiced Mastery); Kinect Adventures leans Execution (Pure Mechanics).
Kinect Adventures leans a little harder on execution, though the gap is small.
Half-Life 2: Lost Coast
A short stretch of standard Half-Life 2 gunplay
Kinect Adventures
Full-body motion timing is the only test present
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2: Lost Coast
A handful of scripted Combine soldiers
Kinect Adventures
No adaptive opposition in minigames
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2: Lost Coast
One fixed level with nothing hidden
Kinect Adventures
Obstacle sequences barely vary
Half-Life 2: Lost Coast leans a little harder on optimization, though the gap is small.
Half-Life 2: Lost Coast
Too brief to develop any systems layer
Kinect Adventures
Minigames are too simple to optimise meaningfully
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.