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 · Competitive PvP
Combined-arms multiplayer shooter famous for map-altering levolution moments and 64-player conquest.

Execution · Competitive PvP
Precise stick control plus constant adaptation to a human opponent's tactics.
Battlefield 4 leans Execution (Competitive PvP); Pro Evolution Soccer 2019 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 4
Gunplay, vehicle mastery, and movement under fire
Pro Evolution Soccer 2019
Dribble touch, pass weight and finishing demand precise sticks
Pro Evolution Soccer 2019 leans a little harder on reads, though the gap is small.
Battlefield 4
Human teams adapt to flanks and levolution chokes
Pro Evolution Soccer 2019
Human opponents adapt formations and punish predictable patterns
Battlefield 4 leans a little harder on variance, though the gap is small.
Battlefield 4
Map-altering events and spawns inject noise
Pro Evolution Soccer 2019
Deflections and keeper randomness add bounded chaos
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield 4
Loadout tuning and objective rotation knowledge
Pro Evolution Soccer 2019
Tactics, instructions and set-piece routines 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.