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

Optimization · Pure Optimization
A break-and-boost JRPG carried by job-routing and party-composition planning.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Octopath Traveler leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Octopath Traveler
Turn-based, no input demand
Portal
Portal placement timing modest.
Octopath Traveler leans a little harder on reads, though the gap is small.
Octopath Traveler
Scripted enemies
Portal
No adversary modeling player.
Octopath Traveler leans clearly harder on variance.
Octopath Traveler
Hit, crit, and break rolls
Portal
Deterministic chambers; no randomness.
Octopath Traveler leans a little harder on optimization, though the gap is small.
Octopath Traveler
Job, break-boost, party routing deeply rewarded
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.