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 · Practiced Mastery
The console FPS landmark that introduced Master Chief and the ring world.

Execution · Practiced Mastery
Stick-skill execution and opponent habit-reading over a solvable hockey meta.
Halo: Combat Evolved leans Execution (Practiced Mastery); NHL 23 leans Execution (Practiced Mastery).
Halo: Combat Evolved leans a little harder on execution, though the gap is small.
Halo: Combat Evolved
Aim, grenade timing, and vehicle control
NHL 23
Skill-stick dekes and shot timing carry possession play
NHL 23 leans a little harder on reads, though the gap is small.
Halo: Combat Evolved
Multiplayer duels reward reading humans
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.
Halo: Combat Evolved
Covenant AI varies tactics slightly
NHL 23
Bounces, deflections and goalie AI add noise
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Halo: Combat Evolved
Weapon sandbox knowledge and encounter routing
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.