head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Practiced Mastery
Aggressive circuit racing testing car control over memorisable tracks and braking points.

Execution · Practiced Mastery
An isometric combat racer set to metal covers, mixing vehicle upgrades with weaponized laps.
Race Driver: Grid leans Execution (Practiced Mastery); Rock n' Roll Racing leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Race Driver: Grid
Aggressive wheel-to-wheel car control is the core demand
Rock n' Roll Racing
Isometric cornering and weapon timing carry races.
Race Driver: Grid leans a little harder on reads, though the gap is small.
Race Driver: Grid
Online racing adds light opponent positioning awareness
Rock n' Roll Racing
Two-player duels add slight prediction; AI is scripted.
Rock n' Roll Racing leans a little harder on variance, though the gap is small.
Race Driver: Grid
Damage outcomes add slight unpredictability to contact
Rock n' Roll Racing
Weapon exchanges and pickups create chaos.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Race Driver: Grid
Braking points, lines and flashback management are learnable
Rock n' Roll Racing
Upgrade purchases and planet-by-planet earnings are plannable.
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.