head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Optimization · Pure Optimization
A refined break-and-boost JRPG won by job and latent-power optimization.

Optimization · Pure Optimization
An auto-attacker where picking the right weapon evolutions wins by itself.
Octopath Traveler II leans Optimization (Pure Optimization); Vampire Survivors leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Octopath Traveler II
Turn-based, no input demand
Vampire Survivors
Movement is trivial; no aim or precision required.
Octopath Traveler II leans a little harder on reads, though the gap is small.
Octopath Traveler II
Scripted enemies
Vampire Survivors
Enemies follow fixed spawn scripts; no adaptive opponent.
Vampire Survivors leans a little harder on variance, though the gap is small.
Octopath Traveler II
Hit, crit, and break rolls
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.
Octopath Traveler II
Job, latent power, party routing deeply rewarded
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.