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
High-speed maze execution along planned score-maximizing routes.

Execution · Practiced Mastery
Nintendo's branching rail shooter where score medals demand perfected routes.
Pac-Man Championship Edition 2 leans Execution (Practiced Mastery); Star Fox 64 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.
Pac-Man Championship Edition 2
Cornering at top speed under pressure decides scores
Star Fox 64
Rail-shooter aim, barrel rolls, and boost timing are everything
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Pac-Man Championship Edition 2
Ghost trains follow deterministic patterns
Star Fox 64
Entirely scripted bosses and waves
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Pac-Man Championship Edition 2
Mazes and spawns are fixed per course
Star Fox 64
Fully deterministic once routes are known
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Pac-Man Championship Edition 2
Score routes and ghost-train herding are deeply plannable
Star Fox 64
Medal scores and route branches reward total memorization
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.