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
Arcade shmup famous for its bullet-reflect barrier and scores running into the quintillions.
Comix Zone leans Execution (Pure Mechanics); Giga Wing 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
Giga Wing
Reflect-timing and dodging under heavy fire
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
Giga Wing
Scripted waves with no adaptation
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
Giga Wing
Deterministic patterns around the reflect mechanic
Giga Wing leans a little harder on optimization, though the gap is small.
Comix Zone
Panel routes and item use are memorizable
Giga Wing
Reflect-force timing and medal routes set astronomical scores
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.