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

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

Execution · Practiced Mastery
Open-world driving that tests car control with a tuning layer underneath.
Driver leans Execution (Pure Mechanics); Forza Horizon 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
Forza Horizon
Driving skill with assists off carries every event
Forza Horizon leans a little harder on reads, though the gap is small.
Driver
Police AI is mappable
Forza Horizon
AI drivatars follow patterns; casual online adds little
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
Forza Horizon
The open world is fixed and fully discoverable
Forza Horizon leans a little harder on optimization, though the gap is small.
Driver
City routes and mission tactics learnable
Forza Horizon
Car tuning and racing lines reward systematic study
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.