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 · Pure Mechanics
The 70s-cinema getaway driving game with famously demanding physics.

Execution · Pure Mechanics
A bite-sized RC racer testing precision car control over memorised racing lines.
Driver leans Execution (Pure Mechanics); MotorStorm: RC leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Driver
Handbrake control and pursuit driving by feel
MotorStorm: RC
Tight RC handling on short tracks rewards pure car control
MotorStorm: RC leans a little harder on reads, though the gap is small.
Driver
Police AI is mappable
MotorStorm: RC
Mostly time-attack versus static ghosts and AI
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Driver
Traffic adds mild unpredictability
MotorStorm: RC
Deterministic tracks, identical every lap
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Driver
City routes and mission tactics learnable
MotorStorm: RC
Vehicle class choice and racing lines decide leaderboard times
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.