head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Practiced Mastery
A near-future Call of Duty with squad-focused multiplayer and the Extinction mode.

Execution · Practiced Mastery
The console FPS landmark that introduced Master Chief and the ring world.
Call of Duty: Ghosts leans Execution (Practiced Mastery); Halo: Combat Evolved leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Ghosts
Fast time-to-kill rewards first-shot aim
Halo: Combat Evolved
Aim, grenade timing, and vehicle control
Call of Duty: Ghosts leans a little harder on reads, though the gap is small.
Call of Duty: Ghosts
Outguessing human routes and peeks matters
Halo: Combat Evolved
Multiplayer duels reward reading humans
Call of Duty: Ghosts leans a little harder on variance, though the gap is small.
Call of Duty: Ghosts
Spawns and lobby matchups add noise
Halo: Combat Evolved
Covenant AI varies tactics slightly
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Ghosts
Loadout and map knowledge are solvable layers
Halo: Combat Evolved
Weapon sandbox knowledge and encounter routing
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.