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

Execution · Pure Mechanics
Precision car control over learnable racing lines and braking points.
F-Zero X leans Execution (Pure Mechanics); TOCA 2: Touring Car Challenge 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.
F-Zero X
Sixty-frame control of thirty machines at top speed
TOCA 2: Touring Car Challenge
Perfect inputs through every corner is what wins races
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
TOCA 2: Touring Car Challenge
AI drivers follow set racing lines, not your psychology
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
TOCA 2: Touring Car Challenge
Weather shifts races slightly, otherwise deterministic
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
TOCA 2: Touring Car Challenge
Racing lines, braking points and setups are solvable per track
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.