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
Stick precision and constant prediction of a human opponent's tactical habits.

Execution · Grand Arena
Team-based 5v5 Star Wars starfighter combat with cockpit power management.
Pro Evolution Soccer 2015 leans Execution (Competitive PvP); Star Wars: Squadrons leans Execution (Grand Arena).
Star Wars: Squadrons leans a little harder on execution, though the gap is small.
Pro Evolution Soccer 2015
First touch, through-ball timing and finishing demand precise sticks
Star Wars: Squadrons
Drifting, aim, and throttle tricks decide dogfights
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Pro Evolution Soccer 2015
Human opponents bait, switch tactics and punish habits
Star Wars: Squadrons
Human pilots in 5v5 bait, juke, and counter-adapt
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Pro Evolution Soccer 2015
Deflections and referee calls add bounded chaos
Star Wars: Squadrons
Full information maps; little randomness
Star Wars: Squadrons leans a little harder on optimization, though the gap is small.
Pro Evolution Soccer 2015
Formations, player roles and set pieces reward study
Star Wars: Squadrons
Power management and loadout meta are solvable layers
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.