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 N64 entry whose boost-or-survive health gamble layers routing decisions onto raw speed control.

Execution · Practiced Mastery
A circuit racing simulator where consistent lap-time execution and car setup decide everything.
F-Zero X leans Execution (Pure Mechanics); Forza Motorsport 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.
F-Zero X
Sixty-frame control of thirty machines at top speed
Forza Motorsport
Lap-time precision: braking points, apexes, throttle discipline
Forza Motorsport leans a little harder on reads, though the gap is small.
F-Zero X
Rival AI is non-adaptive
Forza Motorsport
Racecraft against humans matters but is secondary
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
F-Zero X
X Cup random tracks are a minor mode
Forza Motorsport
Little randomness beyond grid position
Forza Motorsport leans a little harder on optimization, though the gap is small.
F-Zero X
Boost-health tradeoffs and shortcuts reward routing
Forza Motorsport
Setup tuning and tire/fuel strategy are deeply solvable
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.