head to head
Neither is simply harder - they are hard in different places. Driveclub demands more execution; Grand Theft Auto V demands more reads.

Execution · Practiced Mastery
A handsome team-based arcade racer built on club challenges.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Driveclub leans Execution (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Driveclub leans clearly harder on execution.
Driveclub
Clean racing lines and weather-handling by hand
Grand Theft Auto V
Driving and shooting demand decent inputs.
Grand Theft Auto V leans clearly harder on reads.
Driveclub
AI racers don't adapt; async challenges aren't live
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Grand Theft Auto V leans a little harder on variance, though the gap is small.
Driveclub
Dynamic weather varies grip slightly
Grand Theft Auto V
Some mission and lobby randomness.
Driveclub leans a little harder on optimization, though the gap is small.
Driveclub
Track knowledge and corner optimisation accumulate
Grand Theft Auto V
Heists, money loops, builds learnable.
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.