head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
Aim and movement through a fully scripted campaign that route knowledge solves.

Execution · Practiced Mastery
Seamless 3D platformer about collecting power cells across a precursor world.
Half-Life: Source leans Execution (Practiced Mastery); Jak and Daxter: The Precursor Legacy leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life: Source
Aim, movement and platforming through Black Mesa's gauntlets
Jak and Daxter: The Precursor Legacy
Precise jumping and combo movement
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life: Source
Marines and aliens run impressive but fixed scripts
Jak and Daxter: The Precursor Legacy
Lurkers follow set patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life: Source
Fully authored campaign, nothing random
Jak and Daxter: The Precursor Legacy
Static seamless world
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life: Source
Route knowledge and resource management trivialise replays
Jak and Daxter: The Precursor Legacy
Power-cell routing across the connected world
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.