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 pure paddle-precision breakout test with nothing hidden beneath.

Execution · Pure Mechanics
Combo execution and dodge timing through scripted grindhouse brawls.
Alleyway leans Execution (Pure Mechanics); Shank leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Alleyway
Paddle precision and angle control decide every screen
Shank
Combo juggling and dodge timing carry every brawl
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Alleyway
Bricks cannot fight back
Shank
Enemies and bosses attack on fixed patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Alleyway
Ball physics are deterministic with minor bounce uncertainty
Shank
Hand-built levels with no randomness
Shank leans a little harder on optimization, though the gap is small.
Alleyway
Brick-clearing order barely matters beyond basics
Shank
Weapon-swap combo routing rewards some lab work
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.