head to head
Neither is simply harder - they are hard in different places. FIFA Soccer 11 demands more execution; Thief Town demands more reads.

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

Reads · Pure Mind Games
A local-multiplayer stealth game about blending in and reading which figures are human.
FIFA Soccer 11 leans Execution (Competitive PvP); Thief Town leans Reads (Pure Mind Games).
FIFA Soccer 11 leans clearly harder on execution.
FIFA Soccer 11
Pass timing, dribbling and finishing demand stick skill
Thief Town
Timed stab inputs matter but aren't the ceiling
Thief Town leans clearly harder on reads.
FIFA Soccer 11
Human opponents' defensive habits and attacking patterns must be modelled
Thief Town
Reading human players hiding among NPCs 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
Thief Town
Crowd of identical NPCs hides players, adding uncertainty
FIFA Soccer 11 leans clearly harder on optimization.
FIFA Soccer 11
Formations, tactics and squad knowledge shape matches
Thief Town
Little system to solve beyond the bluffing layer
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.