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
A licensed brawler testing spacing and pattern memorisation through fixed stages.

Execution · Practiced Mastery
Arcade brawler positioning and stamina against memorisable enemy waves.
Batman Returns 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.
Batman Returns
Crowd control spacing and boss timing carry the game
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.
Batman Returns
Clowns attack in fixed waves
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.
Batman Returns
Stages never change between attempts
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.
Batman Returns
Learning enemy waves and item spots is the depth
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.