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
One of the most mechanically demanding racers ever made, where mastering its physics tech is everything.

Execution · Practiced Mastery
Consistent precision driving on top of a solvable car-setup and racing-line layer.
F-Zero GX leans Execution (Pure Mechanics); World Circuit: The Grand Prix Race Simulation leans Execution (Practiced Mastery).
F-Zero GX leans a little harder on execution, though the gap is small.
F-Zero GX
Snaking and frame-tight control at absurd speeds
World Circuit: The Grand Prix Race Simulation
Lap-after-lap precision driving decides every race outcome
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
F-Zero GX
No adaptive opposition
World Circuit: The Grand Prix Race Simulation
AI drivers follow fixed racing lines, not minds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
F-Zero GX
Fixed tracks, deterministic physics
World Circuit: The Grand Prix Race Simulation
Weather adds minor unpredictability to otherwise deterministic racing
World Circuit: The Grand Prix Race Simulation leans a little harder on optimization, though the gap is small.
F-Zero GX
Machine settings and advanced technique routes are mappable
World Circuit: The Grand Prix Race Simulation
Car setup, gear ratios and racing lines are solvable engineering
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.