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

Execution · Competitive PvP
Fast arena-fighter execution plus guessing games against a human opponent.

Execution · Competitive PvP
Stick execution and outguessing a human defender, with tactics underneath.
Dragon Ball Z: Budokai Tenkaichi 3 leans Execution (Competitive PvP); FIFA Soccer 08 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 Z: Budokai Tenkaichi 3
Combo timing, dashes and beam clashes demand fast hands
FIFA Soccer 08
Dribbling, timing tackles and finishing reward stick 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 3
Versus humans, baiting counters and vanish wars is prediction
FIFA Soccer 08
Versus humans, baiting defenders and disguising attacks is core
FIFA Soccer 08 leans a little harder on variance, though the gap is small.
Dragon Ball Z: Budokai Tenkaichi 3
Almost nothing hidden once both rosters are known
FIFA Soccer 08
Ball physics adds bounce noise to single matches
Dragon Ball Z: Budokai Tenkaichi 3 leans a little harder on optimization, though the gap is small.
Dragon Ball Z: Budokai Tenkaichi 3
Character tiers and combo routes form a learnable layer
FIFA Soccer 08
Formations and squad selection matter but stay shallow
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.