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

Optimization · Pure Optimization
The original monster-collecting RPG that built the catch-train-battle loop.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Pokémon Red leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Pokémon Red
Turn-based menus
Portal
Portal placement timing modest.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon Red
Trainer AI is rudimentary and fixed
Portal
No adversary modeling player.
Pokémon Red leans clearly harder on variance.
Pokémon Red
Wild encounters and catch rolls
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 Red
Type matchups and team building solve the campaign
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.