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
First-person medieval melee where feints and drags duel human reads.

Reads · Competitive PvP
Minimalist fencing duel that is almost entirely about out-guessing one human.
Chivalry: Medieval Warfare leans Execution (Competitive PvP); Nidhogg leans Reads (Competitive PvP).
Chivalry: Medieval Warfare leans a little harder on execution, though the gap is small.
Chivalry: Medieval Warfare
Swing manipulation, footwork, and parry timing
Nidhogg
Sword-height changes and dive-kicks need quick hands
Nidhogg leans a little harder on reads, though the gap is small.
Chivalry: Medieval Warfare
Feints and drags against adapting humans
Nidhogg
Pure human duels of feints and conditioning
Chivalry: Medieval Warfare leans a little harder on variance, though the gap is small.
Chivalry: Medieval Warfare
Battlefield chaos with many players
Nidhogg
Symmetric deterministic arenas
Chivalry: Medieval Warfare leans a little harder on optimization, though the gap is small.
Chivalry: Medieval Warfare
Class loadouts and objective knowledge
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.