head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, 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 stick execution and opponent reading, salted with bounce-of-the-ball luck.
Battlefield 3 leans Execution (Competitive PvP); FIFA Soccer 07 leans Execution (Competitive PvP).
Battlefield 3 leans a little harder on execution, though the gap is small.
Battlefield 3
Gunplay, suppression management, and vehicle piloting
FIFA Soccer 07
Stick skills and timing on passes and finishing
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 07
Versus humans, baiting tackles and disguising attacks matters
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 07
Deflections and keeper randomness swing single 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 07
Formations and exploit patterns are learnable meta
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.