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
Mechanical football control plus predicting how a human opponent attacks.

Execution · Competitive PvP
The peak-era Konami football game prized for weighty, skill-driven match play.
FIFA 16 leans Execution (Competitive PvP); Pro Evolution Soccer 6 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 16
Dribbling, defending and finishing inputs decide duels
Pro Evolution Soccer 6
First touch, through balls, and dribbles demand precise control
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 16
Human opponents online adapt tactics match to match
Pro Evolution Soccer 6
Versus matches are constant feint and positioning prediction
FIFA 16 leans a little harder on variance, though the gap is small.
FIFA 16
Deflections and finishing randomness swing close games
Pro Evolution Soccer 6
Deflections and keeper spills add light randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 16
Formations and squad construction reward study
Pro Evolution Soccer 6
Formations and player roles are studyable
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.