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
A light-gun rail shooter testing reflexes and precise aim against dinosaurs.

Execution · Pure Mechanics
A run-and-gun arcade shooter that is almost pure twitch execution.
Dino Stalker leans Execution (Pure Mechanics); Metal Slug 5 leans Execution (Pure Mechanics).
Metal Slug 5 leans a little harder on execution, though the gap is small.
Dino Stalker
Light-gun aim and fast reactions decide survival
Metal Slug 5
precise dodge/shoot run-and-gun demands
Dino Stalker leans a little harder on reads, though the gap is small.
Dino Stalker
Dinosaurs charge on fixed scripts, nothing to predict
Metal Slug 5
enemy waves are fully scripted patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dino Stalker
Spawn timing adds modest unpredictability
Metal Slug 5
minor drop and spawn randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dino Stalker
Ammo and weapon management are light secondary concerns
Metal Slug 5
weapon pickup and route memorization
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.