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 · Practiced Mastery
Vehicular mayhem testing car handling plus knowing when wrecking beats racing.

Execution · Practiced Mastery
An open-world arcade racer across Australia where car control and tuning carry every event.
Carmageddon II: Carpocalypse Now leans Execution (Practiced Mastery); Forza Horizon 3 leans Execution (Practiced Mastery).
Forza Horizon 3 leans a little harder on execution, though the gap is small.
Carmageddon II: Carpocalypse Now
Perfect car control trivialises wrecking AI opponents and surviving
Forza Horizon 3
Car control and racing lines at speed
Forza Horizon 3 leans a little harder on reads, though the gap is small.
Carmageddon II: Carpocalypse Now
AI drivers follow set behaviours, never modelling the player
Forza Horizon 3
Drivatars mimic but don't truly adapt
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Carmageddon II: Carpocalypse Now
Pickup spawns and physics chaos add modest run-to-run noise
Forza Horizon 3
Minor traffic and event variation
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Carmageddon II: Carpocalypse Now
Choosing wreck-versus-race strategy and upgrade economy is solvable
Forza Horizon 3
Tuning, car choice, and route knowledge
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.