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 · Competitive PvP
An anime fighter testing combo execution and counter-baiting against human opponents.

Execution · Competitive PvP
Stick skills and finishing wrapped around reading a human opponent's tendencies.
Dragon Ball Z: Budokai 3 leans Execution (Competitive PvP); FIFA Soccer 09 leans Execution (Competitive PvP).
FIFA Soccer 09 leans a little harder on execution, though the gap is small.
Dragon Ball Z: Budokai 3
Combo execution, teleport counters and beam timing demand hands
FIFA Soccer 09
Dribbling, timed tackles and finishing demand precise inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon Ball Z: Budokai 3
Versus humans, baiting teleports and guessing cancels decides exchanges
FIFA Soccer 09
Human opponents shift tactics and exploit your habits mid-match
FIFA Soccer 09 leans a little harder on variance, though the gap is small.
Dragon Ball Z: Budokai 3
Almost nothing random beyond minor clash inputs
FIFA Soccer 09
Rebounds and referee moments add minor randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon Ball Z: Budokai 3
Capsule builds and matchup knowledge underpin competitive play
FIFA Soccer 09
Squad selection and tactical setups are a solvable layer
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.