head to head
vs
Grand Prix 4vsProject CARS
Grand Prix 4 leans Execution (Practiced Mastery); Project CARS leans Execution (Practiced Mastery).
Grand Prix 4Project CARS
Axis by axis
Execution8 vs 8
Even - both lean on execution about the same.
Reads2 vs 2
Even - both lean on reads about the same.
Variance2 vs 2
Even - both lean on variance about the same.
Optimization7 vs 6
Grand Prix 4 leans harder on optimization: Setup tuning and optimal lines are a deep solvable layer
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.