head to head
Neither is simply harder - they are hard in different places. Freshly-Picked Tingle's Rosy Rupeeland demands more reads; Portal demands more execution.

Optimization · Pure Optimization
An adventure about haggling and managing money where rupees are your life force.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Freshly-Picked Tingle's Rosy Rupeeland leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Freshly-Picked Tingle's Rosy Rupeeland
Simple touch controls; little twitch demand
Portal
Portal placement timing modest.
Freshly-Picked Tingle's Rosy Rupeeland leans clearly harder on reads.
Freshly-Picked Tingle's Rosy Rupeeland
NPC haggling has fixed thresholds, not adaptive modeling
Portal
No adversary modeling player.
Freshly-Picked Tingle's Rosy Rupeeland leans clearly harder on variance.
Freshly-Picked Tingle's Rosy Rupeeland
Price-guessing has hidden bounds to probe
Portal
Deterministic chambers; no randomness.
Portal leans a little harder on optimization, though the gap is small.
Freshly-Picked Tingle's Rosy Rupeeland
Managing rupees and haggling efficiently is the core test
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.