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

Execution · Competitive PvP
Mobile shooter execution with human prediction, plus loot variance in battle royale.

Execution · Competitive PvP
Football execution with finer dribble control, human prediction, and bounce luck.
Call of Duty: Mobile leans Execution (Competitive PvP); FIFA Soccer 10 leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Mobile
Touch or controller aim and movement decide gunfights
FIFA Soccer 10
360-degree dribbling raised the stick-skill ceiling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Mobile
Human lobbies adapt rotations and peeks each match
FIFA Soccer 10
Outguessing a human defender's tackle timing is constant
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Mobile
Battle royale drops and loot add run-to-run randomness
FIFA Soccer 10
Deflections and keeper randomness swing tight matches
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Mobile
Loadout meta and map spawn knowledge reward study
FIFA Soccer 10
Formations, tactics and manager mode reward study
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.