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 · Competitive PvP
Outplaying a human opponent through input precision and constant tactical guessing.

Reads · Competitive PvP
Open-world pirate game with PvPvE ship combat.
FIFA 22 leans Execution (Competitive PvP); Sea of Thieves leans Reads (Competitive PvP).
FIFA 22 leans a little harder on execution, though the gap is small.
FIFA 22
Perfect inputs win skill moves, timed finishing and defending
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.
FIFA 22
Outguessing a human's passing and defensive habits is the edge
Sea of Thieves
PvP ship fights are pure mind games
Sea of Thieves leans a little harder on variance, though the gap is small.
FIFA 22
Deflections, ref calls and pack luck inject real randomness
Sea of Thieves
Server encounters, weather, loot vary
Sea of Thieves leans a little harder on optimization, though the gap is small.
FIFA 22
Formations, tactics and squad building sit underneath the duel
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.