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
Trick execution and combo line planning across fixed BMX playgrounds.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Dave Mirra Freestyle BMX leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Dave Mirra Freestyle BMX leans a little harder on execution, though the gap is small.
Dave Mirra Freestyle BMX
Trick inputs, balance and landing timing are the whole test
Half-Life 2
Gravity gun and shooting demand precision.
Half-Life 2 leans a little harder on reads, though the gap is small.
Dave Mirra Freestyle BMX
No opponent - score attack against the course
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.
Dave Mirra Freestyle BMX
Levels are fixed playgrounds
Half-Life 2
Almost no randomness.
Dave Mirra Freestyle BMX leans a little harder on optimization, though the gap is small.
Dave Mirra Freestyle BMX
Line planning and combo routing multiply scores
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.