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 execution and reading human opponents within a meta-driven system.

Execution · Competitive PvP
Tests stick skills and constant prediction of a human opponent's attacking intent.
FIFA 18 leans Execution (Competitive PvP); World Soccer Winning Eleven 6: Final Evolution 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 18
Perfect stick skill and timing dominate dribbles and finishing
World Soccer Winning Eleven 6: Final Evolution
First-touch timing, through-balls and finishing are mechanical skill
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 18
Human opponents bait, switch tactics and counter your habits
World Soccer Winning Eleven 6: Final Evolution
Human opponents constantly disguise attacks and adjust defending
FIFA 18 leans a little harder on variance, though the gap is small.
FIFA 18
Bounce physics and pack luck add measured chaos
World Soccer Winning Eleven 6: Final Evolution
Deflections and keeper bounces add minor chaos
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 18
Formation, squad chemistry and meta mechanics reward study
World Soccer Winning Eleven 6: Final Evolution
Formations, Master League squad building reward system knowledge
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.