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.

Optimization · Pure Optimization
A grand tactical RPG where deep class and alignment optimization against scripted enemy formations defines mastery.

Optimization · Pure Optimization
An auto-attacker where picking the right weapon evolutions wins by itself.
Ogre Battle 64 leans Optimization (Pure Optimization); Vampire Survivors leans Optimization (Pure Optimization).
Ogre Battle 64 leans a little harder on execution, though the gap is small.
Ogre Battle 64
Real-time unit marching is automatic; player input minimal
Vampire Survivors
Movement is trivial; no aim or precision required.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Ogre Battle 64
Enemy leaders scripted; no adaptive AI
Vampire Survivors
Enemies follow fixed spawn scripts; no adaptive opponent.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Ogre Battle 64
Unit encounter randomness and morale swings add moderate variance
Vampire Survivors
Level-up offerings and pickup drops are randomized.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Ogre Battle 64
Unit class configuration, formation, and alignment routing are the dominant system
Vampire Survivors
Evolution paths and weapon combinations fully solve the run.
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.