head to head
Neither is simply harder - they are hard in different places. Pokémon Violet demands more variance; Portal demands more execution.

Optimization · Pure Optimization
Open-world monster collecting where team-building optimization decides everything that matters.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Pokémon Violet leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Pokémon Violet
Turn-based menus, traversal needs no precision
Portal
Portal placement timing modest.
Pokémon Violet leans clearly harder on reads.
Pokémon Violet
Only ranked human battles involve predicting switches
Portal
No adversary modeling player.
Pokémon Violet leans clearly harder on variance.
Pokémon Violet
Encounters, IVs and catch rolls add managed randomness
Portal
Deterministic chambers; no randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon Violet
Team building and type math dominate every battle
Portal
Pure puzzle-solving optimization.
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.