head to head
FIFA Soccer 11 asks more than Guilty as Sock!, and the gap is execution.

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

Reads · Pure Mind Games
An online party game about improvising arguments to persuade human judges.
FIFA Soccer 11 leans Execution (Competitive PvP); Guilty as Sock! leans Reads (Pure Mind Games).
FIFA Soccer 11 leans clearly harder on execution.
FIFA Soccer 11
Pass timing, dribbling and finishing demand stick skill
Guilty as Sock!
No twitch input; it's a talking party game
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
Guilty as Sock!
Persuading human players and judges is the core
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
Guilty as Sock!
Absurd evidence cards add hidden, random elements
FIFA Soccer 11 leans clearly harder on optimization.
FIFA Soccer 11
Formations, tactics and squad knowledge shape matches
Guilty as Sock!
Little system to solve beyond rhetoric and bluffing
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.