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

Execution · Pure Mechanics
A bullet-hell shmup testing dodging precision and scoring optimisation against fixed patterns.
Comix Zone leans Execution (Pure Mechanics); eXceed Gun Bullet Children leans Execution (Pure Mechanics).
eXceed Gun Bullet Children leans a little harder on execution, though the gap is small.
Comix Zone
Brutal one-life brawling demands clean play
eXceed Gun Bullet Children
Weaving through dense bullet patterns is the whole test
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
eXceed Gun Bullet Children
Solo bullet hell, no adaptive opponent
eXceed Gun Bullet Children leans a little harder on variance, though the gap is small.
Comix Zone
Everything is placed and scripted
eXceed Gun Bullet Children
Patterns are fixed and memorisable, not random
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Comix Zone
Panel routes and item use are memorizable
eXceed Gun Bullet Children
Scoring systems and weapon choice reward optimisation
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.