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
First-person physics platformer about leaping across a convoy of crashing trucks.

Execution · Practiced Mastery
Twitch dodging and shooting layered over memorised arcade stage routes.
Clustertruck leans Execution (Pure Mechanics); Metal Slug leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Clustertruck
Frame-tight jumps across moving trucks
Metal Slug
Dodging dense bullet patterns and precise shots carry every credit
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Clustertruck
No opponent
Metal Slug
Enemies follow fixed arcade scripts, never adapt
Clustertruck leans a little harder on variance, though the gap is small.
Clustertruck
Physics chaos makes truck piles unpredictable
Metal Slug
Spawns are nearly deterministic once a stage is learned
Metal Slug leans a little harder on optimization, though the gap is small.
Clustertruck
Route lines and ability use for speedruns
Metal Slug
One-credit clears come from memorising routes and spawn patterns
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.