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 pure optimization exercise where sphere grid planning and boss weakness exploitation defines mastery.

Optimization · Pure Optimization
A break-and-boost JRPG carried by job-routing and party-composition planning.
Final Fantasy X leans Optimization (Pure Optimization); Octopath Traveler 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.
Final Fantasy X
Fully turn-based; zero time pressure on inputs
Octopath Traveler
Turn-based, no input demand
Octopath Traveler leans a little harder on reads, though the gap is small.
Final Fantasy X
All aeons and fiends operate on fixed AI scripts
Octopath Traveler
Scripted enemies
Octopath Traveler leans a little harder on variance, though the gap is small.
Final Fantasy X
Minimal RNG in base game; overdrive gauge charges predictably
Octopath Traveler
Hit, crit, and break rolls
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Final Fantasy X
Sphere Grid routing and break damage limits make the game theoretically solvable
Octopath Traveler
Job, break-boost, party routing deeply rewarded
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.