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

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

Execution · Practiced Mastery
Arcade drift racing testing flowing car control and memorised optimal lines.
Driver leans Execution (Pure Mechanics); OutRun 2006: Coast 2 Coast 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.
Driver
Handbrake control and pursuit driving by feel
OutRun 2006: Coast 2 Coast
Sustained drift control at speed is the heart of it
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
OutRun 2006: Coast 2 Coast
Traffic is patterned, not predictive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Driver
Traffic adds mild unpredictability
OutRun 2006: Coast 2 Coast
Route branches you choose yourself - nothing hidden
OutRun 2006: Coast 2 Coast leans a little harder on optimization, though the gap is small.
Driver
City routes and mission tactics learnable
OutRun 2006: Coast 2 Coast
Perfect drift lines and route choice are learnable theory
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.