head to head
Project CARS 2 asks more than Grand Theft Auto V, and the gap is execution.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.

Execution · Practiced Mastery
A multi-class racer where execution ceiling and setup mastery meet dynamic weather strategy.
Grand Theft Auto V leans Execution (Practiced Mastery); Project CARS 2 leans Execution (Practiced Mastery).
Project CARS 2 leans clearly harder on execution.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Project CARS 2
Car-specific handling quirks demand high-precision inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Project CARS 2
Multiplayer racing involves moderate opponent anticipation
Project CARS 2 leans a little harder on variance, though the gap is small.
Grand Theft Auto V
Some mission and lobby randomness.
Project CARS 2
Dynamic weather and road conditions introduce real unknowns
Project CARS 2 leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Project CARS 2
Setup depth and wet-weather strategy are fully solvable
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.