head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Competitive PvP
A rough anime fighter testing input timing and second-guessing a human opponent.

Execution · Competitive PvP
An anime fighter testing combo execution and counter-baiting against human opponents.
Dragon Ball GT: Final Bout leans Execution (Competitive PvP); Dragon Ball Z: Budokai 3 leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon Ball GT: Final Bout
Combo inputs and meteor-counter timing decide exchanges
Dragon Ball Z: Budokai 3
Combo execution, teleport counters and beam timing demand hands
Dragon Ball Z: Budokai 3 leans a little harder on reads, though the gap is small.
Dragon Ball GT: Final Bout
Human opponents bait and adapt in versus play
Dragon Ball Z: Budokai 3
Versus humans, baiting teleports and guessing cancels decides exchanges
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon Ball GT: Final Bout
Nothing hidden once movesets are known
Dragon Ball Z: Budokai 3
Almost nothing random beyond minor clash inputs
Dragon Ball Z: Budokai 3 leans a little harder on optimization, though the gap is small.
Dragon Ball GT: Final Bout
Small roster and shallow systems cap the study layer
Dragon Ball Z: Budokai 3
Capsule builds and matchup knowledge underpin competitive play
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.