head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Pure Mechanics
Brutal rhythm-violence game where perfect timing on a screaming track is all that exists.

Execution · Pure Mechanics
The sequel adds branching routes and quicker targets to the arcade light-gun formula.
Thumper leans Execution (Pure Mechanics); Virtua Cop 2 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.
Thumper
Split-second rhythm inputs at speed are the entire test
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.
Thumper
No opponent, only the track
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.
Thumper
Tracks are fixed and learnable
Virtua Cop 2
Branch choices aside, runs are identical
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Thumper
Memorizing patterns and scoring lines helps mastery
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.