head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
One-thumb tap-timing precision over fixed courses with solvable coin routes.

Execution · Practiced Mastery
Arcade brawler positioning and stamina against memorisable enemy waves.
Super Mario Run leans Execution (Practiced Mastery); Teenage Mutant Ninja Turtles II: The Arcade Game leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Super Mario Run
One-handed tap timing for coin lines demands precision
Teenage Mutant Ninja Turtles II: The Arcade Game
Crowd control timing and positioning under constant pressure
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Super Mario Run
Auto-runner with no adaptive opponent; Toad Rally is asynchronous
Teenage Mutant Ninja Turtles II: The Arcade Game
Foot Clan waves are quarter-munching scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Super Mario Run
Courses are fixed and fully learnable
Teenage Mutant Ninja Turtles II: The Arcade Game
Spawns are fixed and memorisable
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Super Mario Run
Routing perfect coin runs is a solvable layout puzzle
Teenage Mutant Ninja Turtles II: The Arcade Game
Learning safe spots and boss patterns is the progression
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.