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 run-and-gun shooter where memorizing enemy patterns and precise dodging carries survival.

Execution · Pure Mechanics
The sequel adds branching routes and quicker targets to the arcade light-gun formula.
Metal Slug 4 leans Execution (Pure Mechanics); Virtua Cop 2 leans Execution (Pure Mechanics).
Virtua Cop 2 leans a little harder on execution, though the gap is small.
Metal Slug 4
twitch dodging and shooting precision
Virtua Cop 2
Faster targets and hostage shots sharpen the aim test
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Metal Slug 4
fixed enemy waves, no adaptation
Virtua Cop 2
Rail sequences are fixed scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Metal Slug 4
minor drop randomness
Virtua Cop 2
Branch choices aside, runs are identical
Metal Slug 4 leans a little harder on optimization, though the gap is small.
Metal Slug 4
memorized patterns and routes solvable
Virtua Cop 2
Route branches and spawn memorization drive scores
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.