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
Team arena brawls testing mobile combo execution and reading enemy engages.
Dragon Ball Z: Budokai Tenkaichi 2 leans Execution (Competitive PvP); Naruto to Boruto: Shinobi Striker 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
Naruto to Boruto: Shinobi Striker
Aerial movement and combo timing decide 4v4 skirmishes
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
Naruto to Boruto: Shinobi Striker
Human opponents fake engages and rotations constantly
Naruto to Boruto: Shinobi Striker leans a little harder on variance, though the gap is small.
Dragon Ball Z: Budokai Tenkaichi 2
Full movesets are public knowledge
Naruto to Boruto: Shinobi Striker
Some matchmaking and map objective randomness
Naruto to Boruto: Shinobi Striker 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
Naruto to Boruto: Shinobi Striker
Class loadouts and jutsu matchups reward study
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.