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

Execution · Pure Mechanics
Comic-panel beat 'em up notorious for punishing health drain and tough fights.

Execution · Practiced Mastery
Neon top-down massacre where each floor is a one-mistake execution puzzle.
Comix Zone leans Execution (Pure Mechanics); Hotline Miami 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.
Comix Zone
Brutal one-life brawling demands clean play
Hotline Miami
One-hit-death rooms demand flawless fast inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Comix Zone
Enemies follow fixed attack scripts
Hotline Miami
Enemies are dumb scripted reactors
Hotline Miami leans a little harder on variance, though the gap is small.
Comix Zone
Everything is placed and scripted
Hotline Miami
Slight enemy behavior wobble between restarts
Hotline Miami leans a little harder on optimization, though the gap is small.
Comix Zone
Panel routes and item use are memorizable
Hotline Miami
Route planning and mask choice per floor
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.