head to head
Neither is simply harder - they are hard in different places. Dragon Ball Z: Budokai 3 demands more execution; Fantasy Strike demands more reads.

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

Reads · Pure Mind Games
A deliberately simplified fighter that removes execution barriers entirely, leaving pure reads and opponent modelling as the only axis.
Dragon Ball Z: Budokai 3 leans Execution (Competitive PvP); Fantasy Strike leans Reads (Pure Mind Games).
Dragon Ball Z: Budokai 3 leans clearly harder on execution.
Dragon Ball Z: Budokai 3
Combo execution, teleport counters and beam timing demand hands
Fantasy Strike
Inputs are single-button simplified; execution is not a barrier
Fantasy Strike leans clearly harder on reads.
Dragon Ball Z: Budokai 3
Versus humans, baiting teleports and guessing cancels decides exchanges
Fantasy Strike
Stripped-down design amplifies pure opponent modelling and reads
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon Ball Z: Budokai 3
Almost nothing random beyond minor clash inputs
Fantasy Strike
No RNG; all mechanics are transparent and simple
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
Fantasy Strike
Character counterpick knowledge is limited given small roster
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.