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

Execution · Pure Mechanics
Arcade run-and-gun whose one-credit clears demand total spawn memorization and twitch.

Execution · Pure Mechanics
A shmup collection testing reflexes and dodging against memorizable bullet patterns.
Metal Slug 3 leans Execution (Pure Mechanics); Shooting Love, 200X 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.
Metal Slug 3
one-hit deaths demand frame-level dodging and aim
Shooting Love, 200X
Dodging dense bullet patterns at speed is the whole test
Shooting Love, 200X leans a little harder on reads, though the gap is small.
Metal Slug 3
every enemy wave is scripted
Shooting Love, 200X
Enemy waves are fixed patterns, not adaptive
Shooting Love, 200X leans a little harder on variance, though the gap is small.
Metal Slug 3
branching paths vary runs slightly
Shooting Love, 200X
Some spawn variation but largely memorizable
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Metal Slug 3
memorizing spawns is the path to a one-credit clear
Shooting Love, 200X
Scoring systems and routing reward optimal play
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.