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

Execution · Pure Mechanics
A Sega arcade brawler where collecting orbs transforms you into beast forms.

Execution · Practiced Mastery
Arcade brawler positioning and stamina against memorisable enemy waves.
Altered Beast leans Execution (Pure Mechanics); 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.
Altered Beast
Punch timing in a slow brawler
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.
Altered Beast
Enemies spawn on fixed scripts
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.
Altered Beast
Power-up wolves always same spots
Teenage Mutant Ninja Turtles II: The Arcade Game
Spawns are fixed and memorisable
Teenage Mutant Ninja Turtles II: The Arcade Game leans a little harder on optimization, though the gap is small.
Altered Beast
Short, memorisable stage routes
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.