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 · Practiced Mastery
The black-sheep sequel whose passive enemies and dominant guns sand the series' skill ceiling way down.

Execution · Practiced Mastery
A campy 16-bit run-and-gun about rescuing neighbors from B-movie monsters.
Devil May Cry 2 leans Execution (Practiced Mastery); Zombies Ate My Neighbors leans Execution (Practiced Mastery).
Zombies Ate My Neighbors leans a little harder on execution, though the gap is small.
Devil May Cry 2
Infamously easy; guns trivialize most encounters
Zombies Ate My Neighbors
Dodging monsters while sniping with squirt guns
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Devil May Cry 2
Passive enemy AI never pressures, let alone adapts
Zombies Ate My Neighbors
Monster movie AI is fully patterned
Zombies Ate My Neighbors leans a little harder on variance, though the gap is small.
Devil May Cry 2
Flat authored levels hide little
Zombies Ate My Neighbors
Victim placement varies slightly per level
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Devil May Cry 2
Amulet builds and boss patterns fall fast
Zombies Ate My Neighbors
Weapon-versus-monster matchups and level routing
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.