head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Competitive PvP
Asymmetric 4v1 shooter where hunters and monster constantly out-guess each other.

Execution · Competitive PvP
Territory control through shooter execution and constant prediction of adapting human teams.
Evolve leans Execution (Competitive PvP); Splatoon leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Evolve
Tracking shots and monster traversal skill
Splatoon
Aim, swim-form movement and ink management are constant demands
Evolve leans a little harder on reads, though the gap is small.
Evolve
Asymmetric hunter-versus-monster mindgames never settle
Splatoon
Human opponents adapt flanks and pushes every match
Evolve leans a little harder on variance, though the gap is small.
Evolve
Wildlife and map spawn noise
Splatoon
Hidden squids in ink create momentary information gaps
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Evolve
Perk loadouts and stage-up timing knowledge
Splatoon
Weapon kits, map control timing and gear builds reward study
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.