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
Cops-and-robbers spin on Battlefield built around heists, chases, and urban shootouts.

Execution · Competitive PvP
Mobile shooter execution with human prediction, plus loot variance in battle royale.
Battlefield Hardline leans Execution (Competitive PvP); Call of Duty: Mobile 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.
Battlefield Hardline
Close-quarters gunplay and high-speed vehicle chases
Call of Duty: Mobile
Touch or controller aim and movement decide gunfights
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield Hardline
Cops-versus-criminals humans adapt heist tactics
Call of Duty: Mobile
Human lobbies adapt rotations and peeks each match
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield Hardline
Spawns and loot grabs shuffle engagements
Call of Duty: Mobile
Battle royale drops and loot add run-to-run randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield Hardline
Gadget loadouts and mode-specific route knowledge
Call of Duty: Mobile
Loadout meta and map spawn knowledge 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.