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
Classic licensed football testing input control and opponent pattern reading.

Execution · Competitive PvP
An anime arena fighter testing combo execution and versus-match prediction.
FIFA Soccer 2005 leans Execution (Competitive PvP); Saint Seiya: Soldiers' Soul leans Execution (Competitive PvP).
FIFA Soccer 2005 leans a little harder on execution, though the gap is small.
FIFA Soccer 2005
Off-the-ball control and finishing timing are mechanical skill
Saint Seiya: Soldiers' Soul
Combos, dashes and burst timing carry every exchange
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 2005
Human opponents adjust attack patterns across a match
Saint Seiya: Soldiers' Soul
Human versus matches reward predicting blocks and seventh-sense baits
FIFA Soccer 2005 leans a little harder on variance, though the gap is small.
FIFA Soccer 2005
Bounces and keeper behaviour add minor chaos
Saint Seiya: Soldiers' Soul
Nothing hidden once both rosters are known
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 2005
Formations and exploit plays of the era are learnable
Saint Seiya: Soldiers' Soul
Character matchups and cosmo-meter management form a learnable layer
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.