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

Execution · Pure Mechanics
A twin-stick arcade shooter about surviving neon geometric enemy swarms for high score.

Execution · Pure Mechanics
A run-and-gun arcade shooter that is almost pure twitch execution.
Geometry Wars 3: Dimensions Evolved leans Execution (Pure Mechanics); Metal Slug 5 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.
Geometry Wars 3: Dimensions Evolved
Twin-stick precision dodging and shooting under chaos.
Metal Slug 5
precise dodge/shoot run-and-gun demands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Geometry Wars 3: Dimensions Evolved
No opponent modeling the player.
Metal Slug 5
enemy waves are fully scripted patterns
Geometry Wars 3: Dimensions Evolved leans a little harder on variance, though the gap is small.
Geometry Wars 3: Dimensions Evolved
Enemy spawn patterns have randomized elements.
Metal Slug 5
minor drop and spawn randomness
Geometry Wars 3: Dimensions Evolved leans a little harder on optimization, though the gap is small.
Geometry Wars 3: Dimensions Evolved
Scoring routes are learnable but execution dominates.
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.