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
Hardcore racing sim where execution is everything.

Execution · Practiced Mastery
A simulation racer where tuning and clean laps dominate the podium.
Assetto Corsa leans Execution (Practiced Mastery); Gran Turismo 7 leans Execution (Practiced Mastery).
Assetto Corsa leans a little harder on execution, though the gap is small.
Assetto Corsa
Demanding wheel control, braking, throttle precision
Gran Turismo 7
Braking points and throttle modulation define lap times.
Assetto Corsa leans a little harder on reads, though the gap is small.
Assetto Corsa
Light online wheel-to-wheel reads
Gran Turismo 7
AI is scripted; online drivers offer minor adaptation.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Assetto Corsa
Tire and track temp variance
Gran Turismo 7
Tire wear and weather add modest randomness.
Gran Turismo 7 leans a little harder on optimization, though the gap is small.
Assetto Corsa
Setup tuning, car-track combo mastery
Gran Turismo 7
Car setup, tuning, and pit strategy heavily decisive.
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.