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

Execution · Competitive PvP
A sprawling military simulator where realistic ballistics and planning beat reflexes.

Execution · Competitive PvP
Football sim testing execution and opponent reading under a studied tactical meta.
Arma 2 leans Execution (Competitive PvP); FIFA 21 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 2
Ballistics, stance, and positioning over twitch aim
FIFA 21
Skill moves and finishing mechanics demand practiced hands
FIFA 21 leans a little harder on reads, though the gap is small.
Arma 2
Human squads in PvP scenarios adapt
FIFA 21
Outguessing a human's defensive shape and attacking patterns is central
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Arma 2
Vast terrain hides enemy positions
FIFA 21
Deflections, finishing RNG and pack luck colour outcomes
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Arma 2
Doctrine, loadouts, and mission planning
FIFA 21
Meta formations, custom tactics and squad building are studied deeply
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.