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

Execution · Pure Mechanics
Atari's foundational arcade game of bouncing a ball to clear brick walls.

Execution · Pure Mechanics
An early arcade climber demanding tight, repeatable jump execution.
Breakout leans Execution (Pure Mechanics); Donkey Kong Junior leans Execution (Pure Mechanics).
Donkey Kong Junior leans a little harder on execution, though the gap is small.
Breakout
Paddle precision is essentially the entire game
Donkey Kong Junior
precise vine-climbing and jump timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Breakout
No opponent
Donkey Kong Junior
enemies follow fixed patrol patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Breakout
Ball physics are deterministic
Donkey Kong Junior
minor enemy timing variance
Breakout leans a little harder on optimization, though the gap is small.
Breakout
Tunneling strategy to the top row helps
Donkey Kong Junior
minimal route memorization needed
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.