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 · Grand Arena
Open military simulator and PvP sandbox.

Execution · Grand Arena
WWII squad-tactics RTS where cover micro, sector pressure, and doctrine counters form an interlocking test.
Arma 3 leans Execution (Grand Arena); Company of Heroes leans Execution (Grand Arena).
Arma 3 leans a little harder on execution, though the gap is small.
Arma 3
Bullet drop, stance, sway, weight all matter
Company of Heroes
Infantry cover micro and suppression-break timing are precise demands
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
Company of Heroes
Opponent sector pushes and doctrine choices must be predicted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Arma 3
Mission scripts and AI behavior vary
Company of Heroes
Reinforcement point capture variance and munitions drops add uncertainty
Company of Heroes leans a little harder on optimization, though the gap is small.
Arma 3
Loadout planning and tactics solvable
Company of Heroes
Resource point priority and doctrine selection are learnable systems
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.