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 execution and constant prediction of a human opponent's attacking patterns.

Execution · Competitive PvP
The peak-era Konami football game prized for weighty, skill-driven match play.
FIFA Soccer 12 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 Soccer 12
Dribbling, timed tackles and finishing demand practiced sticks
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 Soccer 12
Human opponents adapt formations and attacking habits constantly
Pro Evolution Soccer 6
Versus matches are constant feint and positioning prediction
FIFA Soccer 12 leans a little harder on variance, though the gap is small.
FIFA Soccer 12
Deflections and physics bounces swing tight matches
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 Soccer 12
Formation choices and tactical defending knowledge sit underneath
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.