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

Execution · Competitive PvP
Arcade wrestling testing combo execution and reversal mind-games against humans.
Dragon Ball Z: Budokai Tenkaichi 2 leans Execution (Competitive PvP); WWE All Stars 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 2
Beam clashes, vanish timing and arena movement reward fast hands
WWE All Stars
Juggle combos and reversal timing drive every match
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
WWE All Stars
Human opponents bait reversals in constant mind-games
WWE All Stars leans a little harder on variance, though the gap is small.
Dragon Ball Z: Budokai Tenkaichi 2
Full movesets are public knowledge
WWE All Stars
Slight hit randomness rarely decides outcomes
Dragon Ball Z: Budokai Tenkaichi 2 leans a little harder on optimization, though the gap is small.
Dragon Ball Z: Budokai Tenkaichi 2
A 120-character roster of matchup and item knowledge
WWE All Stars
Class matchups and move properties are quickly 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.