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

Execution · Practiced Mastery
Cave's gothic horizontal bullet hell with player-chosen stage difficulty and item-chain scoring.
Comix Zone leans Execution (Pure Mechanics); Deathsmiles 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
Deathsmiles
Horizontal bullet dodging with dual-direction shooting
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
Deathsmiles
Scripted gothic enemies never adapt
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Comix Zone
Everything is placed and scripted
Deathsmiles
Selectable difficulty fixes patterns, little randomness
Deathsmiles leans a little harder on optimization, though the gap is small.
Comix Zone
Panel routes and item use are memorizable
Deathsmiles
Item counter and rank route choices drive scoring
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.