head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Execution · Competitive PvP
Stick-skill football against human opponents whose habits must be read.

Execution · Competitive PvP
Precise stick control plus constant adaptation to a human opponent's tactics.
FIFA Soccer 13 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.
FIFA Soccer 13
Ball control and finishing inputs decide moments
Pro Evolution Soccer 2019
Dribble touch, pass weight and finishing demand precise sticks
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 13
Online humans keep adjusting their patterns
Pro Evolution Soccer 2019
Human opponents adapt formations and punish predictable patterns
FIFA Soccer 13 leans a little harder on variance, though the gap is small.
FIFA Soccer 13
First-touch randomness and deflections add chaos
Pro Evolution Soccer 2019
Deflections and keeper randomness add bounded chaos
Pro Evolution Soccer 2019 leans a little harder on optimization, though the gap is small.
FIFA Soccer 13
Tactics and squad setup are a studied layer
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.