head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

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

Execution · Practiced Mastery
Massive persistent-war FPS where hundreds of players contest continents simultaneously.
Call of Duty: Ghosts leans Execution (Practiced Mastery); PlanetSide 2 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
PlanetSide 2
Gunplay and vehicle piloting at FPS standards
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Ghosts
Outguessing human routes and peeks matters
PlanetSide 2
Human enemies adapt, diluted across hundreds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Ghosts
Spawns and lobby matchups add noise
PlanetSide 2
Massive battles produce constant chaos
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
PlanetSide 2
Loadouts, terrain, and territory strategy matter
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.