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
Timing on the ball and outguessing the opposing player's tactics.

Execution · Practiced Mastery
Stick-skill execution and opponent habit-reading over a solvable hockey meta.
FIFA Soccer 06 leans Execution (Competitive PvP); NHL 23 leans Execution (Practiced Mastery).
NHL 23 leans a little harder on execution, though the gap is small.
FIFA Soccer 06
First-touch control and shot timing decide chances
NHL 23
Skill-stick dekes and shot timing carry possession play
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 06
Human opponents vary attack patterns and bait tackles
NHL 23
Online opponents reward reading defensive structure habits
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 06
Bounces and keeper spills inject small randomness
NHL 23
Bounces, deflections and goalie AI add noise
NHL 23 leans a little harder on optimization, though the gap is small.
FIFA Soccer 06
Squad selection and tactics reward preparation
NHL 23
Meta builds, line chemistry and set plays are studyable
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.