head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

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

Execution · Pure Mechanics
Arcade driving that tests cornering execution over a small set of memorisable tracks.
MotorStorm: RC leans Execution (Pure Mechanics); Need for Speed II 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
Need for Speed II
Cornering and throttle control decide every race
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
Need for Speed II
AI racers follow rubber-banded scripts, not minds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
MotorStorm: RC
Deterministic tracks, identical every lap
Need for Speed II
Tracks are fixed; nothing meaningful is hidden
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
MotorStorm: RC
Vehicle class choice and racing lines decide leaderboard times
Need for Speed II
Learning six tracks' racing lines and car choice
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.