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
Fast arena-fighter execution plus guessing games against a human opponent.

Execution · Competitive PvP
Classic fighting game testing execution precision and human mix-up prediction.
Dragon Ball Z: Budokai Tenkaichi 3 leans Execution (Competitive PvP); Street Fighter Alpha: Warriors' Dreams leans Execution (Competitive PvP).
Street Fighter Alpha: Warriors' Dreams leans a little harder on execution, though the gap is small.
Dragon Ball Z: Budokai Tenkaichi 3
Combo timing, dashes and beam clashes demand fast hands
Street Fighter Alpha: Warriors' Dreams
Motion inputs, links and Alpha Counters demand clean hands
Street Fighter Alpha: Warriors' Dreams leans a little harder on reads, though the gap is small.
Dragon Ball Z: Budokai Tenkaichi 3
Versus humans, baiting counters and vanish wars is prediction
Street Fighter Alpha: Warriors' Dreams
Footsies and throw mix-ups against a human are the heart
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 Tenkaichi 3
Almost nothing hidden once both rosters are known
Street Fighter Alpha: Warriors' Dreams
Full information once the round starts
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 3
Character tiers and combo routes form a learnable layer
Street Fighter Alpha: Warriors' Dreams
Matchup knowledge and meter management are studyable theory
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.
full breakdown
Dragon Ball Z: Budokai Tenkaichi 3 →
full breakdown
Street Fighter Alpha: Warriors' Dreams →