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

Execution · Competitive PvP
Large-scale modern combined-arms shooter built on destructible maps and squad teamwork.

Execution · Competitive PvP
Football execution with finer dribble control, human prediction, and bounce luck.
Battlefield 3 leans Execution (Competitive PvP); FIFA Soccer 10 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.
Battlefield 3
Gunplay, suppression management, and vehicle piloting
FIFA Soccer 10
360-degree dribbling raised the stick-skill ceiling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield 3
Human teams adapt routes and armor pushes
FIFA Soccer 10
Outguessing a human defender's tackle timing is constant
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield 3
Spawns, destruction, and vehicle drops shuffle engagements
FIFA Soccer 10
Deflections and keeper randomness swing tight matches
Battlefield 3 leans a little harder on optimization, though the gap is small.
Battlefield 3
Unlock paths, class synergy, and map control
FIFA Soccer 10
Formations, tactics and manager mode reward study
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.