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
Precise car control married to tuning and racing-line study.

Optimization · Practiced Mastery
A college football sim about playbooks and rosters.
Forza Motorsport 3 leans Execution (Practiced Mastery); NCAA College Football 2K3 leans Optimization (Practiced Mastery).
Forza Motorsport 3 leans a little harder on execution, though the gap is small.
Forza Motorsport 3
Braking points and throttle control define lap times
NCAA College Football 2K3
snap timing and throwing precision
NCAA College Football 2K3 leans a little harder on reads, though the gap is small.
Forza Motorsport 3
AI drivers follow predictable racing lines
NCAA College Football 2K3
scripted CPU defense, not adaptive
NCAA College Football 2K3 leans a little harder on variance, though the gap is small.
Forza Motorsport 3
Clean circuit racing leaves little to chance
NCAA College Football 2K3
fumbles and bounce randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Forza Motorsport 3
Tuning, upgrades and line study are half the lap time
NCAA College Football 2K3
playbook and roster management
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.