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.

Reads · Competitive PvP
Minimalist fencing duel that is almost entirely about out-guessing one human.

Reads · Competitive PvP
High-stakes spacing duels where one read decides the round.
Nidhogg leans Reads (Competitive PvP); Samurai Shodown 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.
Nidhogg
Sword-height changes and dive-kicks need quick hands
Samurai Shodown
Punishing whiffs demands precise spacing and timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Nidhogg
Pure human duels of feints and conditioning
Samurai Shodown
One-hit stakes make every poke a prediction duel
Samurai Shodown leans a little harder on variance, though the gap is small.
Nidhogg
Symmetric deterministic arenas
Samurai Shodown
Rage meter and item drops add minor randomness
Samurai Shodown leans a little harder on optimization, though the gap is small.
Nidhogg
Small toolkit, little to solve beyond fundamentals
Samurai Shodown
Matchup ranges and punish knowledge underpin the neutral
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.