head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Competitive PvP
Football sim testing stick execution and reading a human opponent's tactical habits.

Execution · Competitive PvP
An online multiplayer soccer game about positioning and outplaying human opponents.
FIFA Soccer 11 leans Execution (Competitive PvP); Soccer Online: Ball 3D 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 11
Pass timing, dribbling and finishing demand stick skill
Soccer Online: Ball 3D
Controlling shots and movement precisely matters in matches
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 11
Human opponents' defensive habits and attacking patterns must be modelled
Soccer Online: Ball 3D
Outguessing human opponents' passes and positioning is constant
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 11
Deflections and keeper behaviour add bounded chaos
Soccer Online: Ball 3D
Some physics unpredictability but mostly skill-driven
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 11
Formations, tactics and squad knowledge shape matches
Soccer Online: Ball 3D
Team coordination and positioning tactics reward planning
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.