head to head
Insurgency: Sandstorm asks more than FIFA Soccer 13, and the gap is execution.

Execution · Competitive PvP
Stick-skill football against human opponents whose habits must be read.

Execution · Competitive PvP
Hardcore tactical shooter with lethal TTK.
FIFA Soccer 13 leans Execution (Competitive PvP); Insurgency: Sandstorm leans Execution (Competitive PvP).
Insurgency: Sandstorm leans clearly harder on execution.
FIFA Soccer 13
Ball control and finishing inputs decide moments
Insurgency: Sandstorm
One-shot kills demand pixel-perfect aim
Insurgency: Sandstorm leans a little harder on reads, though the gap is small.
FIFA Soccer 13
Online humans keep adjusting their patterns
Insurgency: Sandstorm
Holding angles and pushes are mind games
FIFA Soccer 13 leans a little harder on variance, though the gap is small.
FIFA Soccer 13
First-touch randomness and deflections add chaos
Insurgency: Sandstorm
Very low RNG, near pure skill
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 13
Tactics and squad setup are a studied layer
Insurgency: Sandstorm
Loadout points and class roles tuned
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.