head to head
Sea of Thieves asks more than Battlefield 1, and the gap is variance.

Execution · Competitive PvP
WWI conquest shooter with weighty gunplay.

Reads · Competitive PvP
Open-world pirate game with PvPvE ship combat.
Battlefield 1 leans Execution (Competitive PvP); Sea of Thieves leans Reads (Competitive PvP).
Battlefield 1 leans a little harder on execution, though the gap is small.
Battlefield 1
Bolt-actions reward steady aim and timing
Sea of Thieves
Ship sailing and naval gunnery require hands
Sea of Thieves leans a little harder on reads, though the gap is small.
Battlefield 1
Trench flanks and gas plays beat predictions
Sea of Thieves
PvP ship fights are pure mind games
Sea of Thieves leans clearly harder on variance.
Battlefield 1
Behemoth spawns and chaos shift matches
Sea of Thieves
Server encounters, weather, loot vary
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield 1
Class kits and vehicle counters matter
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.