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

Execution · Competitive PvP
Territory control through shooter execution and constant prediction of adapting human teams.

Execution · Competitive PvP
A versus fighter testing motion-input execution and live opponent prediction.
Splatoon leans Execution (Competitive PvP); Teenage Mutant Ninja Turtles: Tournament Fighters 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.
Splatoon
Aim, swim-form movement and ink management are constant demands
Teenage Mutant Ninja Turtles: Tournament Fighters
Special-move inputs and punish timing decide exchanges
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Splatoon
Human opponents adapt flanks and pushes every match
Teenage Mutant Ninja Turtles: Tournament Fighters
Human opponents adapt and bait every round
Splatoon leans a little harder on variance, though the gap is small.
Splatoon
Hidden squids in ink create momentary information gaps
Teenage Mutant Ninja Turtles: Tournament Fighters
Nothing hidden once both characters are known
Splatoon leans a little harder on optimization, though the gap is small.
Splatoon
Weapon kits, map control timing and gear builds reward study
Teenage Mutant Ninja Turtles: Tournament Fighters
Matchup knowledge and move properties underpin play
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.