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 dungeon-crawler RPG testing party building, skill optimization and careful mapping.

Optimization · Pure Optimization
An auto-attacker where picking the right weapon evolutions wins by itself.
Etrian Odyssey V: Beyond the Myth leans Optimization (Pure Optimization); Vampire Survivors leans Optimization (Pure Optimization).
Etrian Odyssey V: Beyond the Myth leans a little harder on execution, though the gap is small.
Etrian Odyssey V: Beyond the Myth
Turn-based combat needs no twitch
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.
Etrian Odyssey V: Beyond the Myth
Enemies scripted, no adaptive opponent
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.
Etrian Odyssey V: Beyond the Myth
Random encounters and FOE patterns partly unknown
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.
Etrian Odyssey V: Beyond the Myth
Class building, skill trees, and mapping drive everything
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.