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
Mobile shooter execution with human prediction, plus loot variance in battle royale.

Execution · Competitive PvP
Execution on the ball plus constant prediction of the other player's shape.
Call of Duty: Mobile leans Execution (Competitive PvP); Pro Evolution Soccer 2009 leans Execution (Competitive PvP).
Call of Duty: Mobile leans a little harder on execution, though the gap is small.
Call of Duty: Mobile
Touch or controller aim and movement decide gunfights
Pro Evolution Soccer 2009
Close control and finishing windows demand stick precision
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
Pro Evolution Soccer 2009
Online and couch opponents adjust tactics against you
Call of Duty: Mobile leans a little harder on variance, though the gap is small.
Call of Duty: Mobile
Battle royale drops and loot add run-to-run randomness
Pro Evolution Soccer 2009
Ricochets and keeper parries add small randomness
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
Pro Evolution Soccer 2009
Squad setup and tactical sliders reward preparation
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.