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

Execution · Grand Arena
Open military simulator and PvP sandbox.

Execution · Competitive PvP
Online football where stick control meets reading opponents.
Arma 3 leans Execution (Grand Arena); EA Sports FC 24 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.
Arma 3
Bullet drop, stance, sway, weight all matter
EA Sports FC 24
Precise stick skills, timing, dribbling under pressure
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Arma 3
PvP and milsim ops reward prediction
EA Sports FC 24
Online play vs adapting humans rewards prediction
Arma 3 leans a little harder on variance, though the gap is small.
Arma 3
Mission scripts and AI behavior vary
EA Sports FC 24
Minor RNG in deflections and momentum swings
Arma 3 leans a little harder on optimization, though the gap is small.
Arma 3
Loadout planning and tactics solvable
EA Sports FC 24
Squad building, tactics, Ultimate Team economy
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.