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 · Practiced Mastery
Arena dueling that mixes build preparation with execution and opponent prediction.

Execution · Practiced Mastery
A team shooter where aim and positioning against human opponents controls the map.
Dissidia 012 Final Fantasy leans Execution (Practiced Mastery); Splatoon 2 leans Execution (Practiced Mastery).
Splatoon 2 leans a little harder on execution, though the gap is small.
Dissidia 012 Final Fantasy
Aerial chases and punish timing demand real dexterity
Splatoon 2
aim and movement decide ink battles
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dissidia 012 Final Fantasy
Versus humans, bravery mind-games and bait punishes matter
Splatoon 2
predicting human opponent positioning
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dissidia 012 Final Fantasy
Little randomness once movesets are known
Splatoon 2
weapon and map rotation randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dissidia 012 Final Fantasy
Builds, equipment and matchup knowledge shape every fight
Splatoon 2
loadout and turf strategy 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.