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

Execution · Pure Mechanics
The N64 entry whose boost-or-survive health gamble layers routing decisions onto raw speed control.

Execution · Practiced Mastery
Arcade car control at speed over memorised tracks with scripted police pressure.
F-Zero X leans Execution (Pure Mechanics); Need for Speed: Hot Pursuit 2 leans Execution (Practiced Mastery).
F-Zero X leans a little harder on execution, though the gap is small.
F-Zero X
Sixty-frame control of thirty machines at top speed
Need for Speed: Hot Pursuit 2
High-speed cornering and traffic dodging are the whole test
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
F-Zero X
Rival AI is non-adaptive
Need for Speed: Hot Pursuit 2
AI racers and cops follow rubber-band scripts
Need for Speed: Hot Pursuit 2 leans a little harder on variance, though the gap is small.
F-Zero X
X Cup random tracks are a minor mode
Need for Speed: Hot Pursuit 2
Cop spawns and traffic add mild run-to-run noise
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
F-Zero X
Boost-health tradeoffs and shortcuts reward routing
Need for Speed: Hot Pursuit 2
Track knowledge and racing lines are learnable and fixed
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.