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

Execution · Pure Mechanics
A bite-sized RC racer testing precision car control over memorised racing lines.

Execution · Pure Mechanics
Holding clean lines at speed through traffic on memorisable point-to-point roads.
MotorStorm: RC leans Execution (Pure Mechanics); The Need for Speed 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.
MotorStorm: RC
Tight RC handling on short tracks rewards pure car control
The Need for Speed
Holding racing lines at speed through traffic is the test
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
MotorStorm: RC
Mostly time-attack versus static ghosts and AI
The Need for Speed
AI rivals and police follow fixed behaviour
The Need for Speed leans a little harder on variance, though the gap is small.
MotorStorm: RC
Deterministic tracks, identical every lap
The Need for Speed
Traffic patterns add mild run-to-run noise
MotorStorm: RC leans a little harder on optimization, though the gap is small.
MotorStorm: RC
Vehicle class choice and racing lines decide leaderboard times
The Need for Speed
Track knowledge and car choice settle quickly
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.