head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Execution · Pure Mechanics
The 70s-cinema getaway driving game with famously demanding physics.

Execution · Pure Mechanics
A fast-paced endless runner starring a sliding penguin.
Driver leans Execution (Pure Mechanics); Faaast Penguin leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Driver
Handbrake control and pursuit driving by feel
Faaast Penguin
reaction-based endless runner reflexes
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Driver
Police AI is mappable
Faaast Penguin
no opponent, solo arcade run
Faaast Penguin leans a little harder on variance, though the gap is small.
Driver
Traffic adds mild unpredictability
Faaast Penguin
procedural obstacle generation
Driver leans a little harder on optimization, though the gap is small.
Driver
City routes and mission tactics learnable
Faaast Penguin
minor route/timing optimization over runs
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.