head to head
Arma 3 asks more than Sea of Thieves, and the gap is execution.

Execution · Grand Arena
Open military simulator and PvP sandbox.

Reads · Competitive PvP
Open-world pirate game with PvPvE ship combat.
Arma 3 leans Execution (Grand Arena); Sea of Thieves leans Reads (Competitive PvP).
Arma 3 leans clearly harder on execution.
Arma 3
Bullet drop, stance, sway, weight all matter
Sea of Thieves
Ship sailing and naval gunnery require hands
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
Sea of Thieves
PvP ship fights are pure mind games
Sea of Thieves leans a little harder on variance, though the gap is small.
Arma 3
Mission scripts and AI behavior vary
Sea of Thieves
Server encounters, weather, loot vary
Arma 3 leans a little harder on optimization, though the gap is small.
Arma 3
Loadout planning and tactics solvable
Sea of Thieves
Routes, loadouts, ship setups solvable
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.