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
Open-world driving that tests car control with a tuning layer underneath.

Execution · Practiced Mastery
Consistent precision driving on top of a solvable car-setup and racing-line layer.
Forza Horizon leans Execution (Practiced Mastery); World Circuit: The Grand Prix Race Simulation leans Execution (Practiced Mastery).
World Circuit: The Grand Prix Race Simulation leans a little harder on execution, though the gap is small.
Forza Horizon
Driving skill with assists off carries every event
World Circuit: The Grand Prix Race Simulation
Lap-after-lap precision driving decides every race outcome
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Forza Horizon
AI drivatars follow patterns; casual online adds little
World Circuit: The Grand Prix Race Simulation
AI drivers follow fixed racing lines, not minds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Forza Horizon
The open world is fixed and fully discoverable
World Circuit: The Grand Prix Race Simulation
Weather adds minor unpredictability to otherwise deterministic racing
World Circuit: The Grand Prix Race Simulation leans a little harder on optimization, though the gap is small.
Forza Horizon
Car tuning and racing lines reward systematic study
World Circuit: The Grand Prix Race Simulation
Car setup, gear ratios and racing lines are solvable engineering
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.