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 · Practiced Mastery
Arcade dogfighting reflexes against scripted enemy flight patterns.

Execution · Pure Mechanics
The 70s-cinema getaway driving game with famously demanding physics.
Air Combat leans Execution (Practiced Mastery); Driver leans Execution (Pure Mechanics).
Driver leans a little harder on execution, though the gap is small.
Air Combat
Stick control and missile timing carry every dogfight
Driver
Handbrake control and pursuit driving by feel
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Air Combat
Enemy pilots fly scripted arcade patterns
Driver
Police AI is mappable
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Air Combat
Missions are fixed and fully learnable
Driver
Traffic adds mild unpredictability
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Air Combat
Plane purchases and mission knowledge smooth the campaign
Driver
City routes and mission tactics learnable
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.