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 bullet-hell shmup testing dodging precision and scoring optimisation against fixed patterns.

Execution · Pure Mechanics
Arcade run-and-gun whose one-credit clears demand total spawn memorization and twitch.
eXceed Gun Bullet Children leans Execution (Pure Mechanics); Metal Slug 3 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.
eXceed Gun Bullet Children
Weaving through dense bullet patterns is the whole test
Metal Slug 3
one-hit deaths demand frame-level dodging and aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
eXceed Gun Bullet Children
Solo bullet hell, no adaptive opponent
Metal Slug 3
every enemy wave is scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
eXceed Gun Bullet Children
Patterns are fixed and memorisable, not random
Metal Slug 3
branching paths vary runs slightly
Metal Slug 3 leans a little harder on optimization, though the gap is small.
eXceed Gun Bullet Children
Scoring systems and weapon choice reward optimisation
Metal Slug 3
memorizing spawns is the path to a one-credit clear
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.