head to head
Nidhogg asks more than Dragon Ball Z: Budokai Tenkaichi 3, and the gap is reads.

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

Reads · Competitive PvP
Minimalist fencing duel that is almost entirely about out-guessing one human.
Dragon Ball Z: Budokai Tenkaichi 3 leans Execution (Competitive PvP); Nidhogg leans Reads (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
Nidhogg
Sword-height changes and dive-kicks need quick hands
Nidhogg leans clearly harder on reads.
Dragon Ball Z: Budokai Tenkaichi 3
Versus humans, baiting counters and vanish wars is prediction
Nidhogg
Pure human duels of feints and conditioning
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
Nidhogg
Symmetric deterministic arenas
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
Nidhogg
Small toolkit, little to solve beyond fundamentals
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.