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
Arena-fighter execution and couch-versus prediction across an enormous anime roster.

Execution · Competitive PvP
Classic licensed football testing input control and opponent pattern reading.
Dragon Ball Z: Budokai Tenkaichi 2 leans Execution (Competitive PvP); FIFA Soccer 2005 leans Execution (Competitive PvP).
FIFA Soccer 2005 leans a little harder on execution, though the gap is small.
Dragon Ball Z: Budokai Tenkaichi 2
Beam clashes, vanish timing and arena movement reward fast hands
FIFA Soccer 2005
Off-the-ball control and finishing timing are mechanical skill
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 Tenkaichi 2
Versus friends, baiting transformations and dodges matters
FIFA Soccer 2005
Human opponents adjust attack patterns across a match
FIFA Soccer 2005 leans a little harder on variance, though the gap is small.
Dragon Ball Z: Budokai Tenkaichi 2
Full movesets are public knowledge
FIFA Soccer 2005
Bounces and keeper behaviour add minor chaos
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 Tenkaichi 2
A 120-character roster of matchup and item knowledge
FIFA Soccer 2005
Formations and exploit plays of the era are learnable
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.