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

Execution · Competitive PvP
Stick execution and reading human opponents within a meta-driven system.

Execution · Competitive PvP
A wrestling game testing grapple timing and prediction in versus matches.
FIFA 18 leans Execution (Competitive PvP); WCW vs. nWo: World Tour leans Execution (Competitive PvP).
FIFA 18 leans a little harder on execution, though the gap is small.
FIFA 18
Perfect stick skill and timing dominate dribbles and finishing
WCW vs. nWo: World Tour
Grapple timing and move inputs need precision
FIFA 18 leans a little harder on reads, though the gap is small.
FIFA 18
Human opponents bait, switch tactics and counter your habits
WCW vs. nWo: World Tour
Versus play rewards reading opponent grapple attempts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 18
Bounce physics and pack luck add measured chaos
WCW vs. nWo: World Tour
Move reversals and spirit meter add randomness
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
WCW vs. nWo: World Tour
Move-set knowledge and stamina management matter
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.