head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Optimization · Pure Optimization
Handheld tactics RPG adding a shifting law system to grid battles.

Optimization · Pure Optimization
A pure optimization exercise where sphere grid planning and boss weakness exploitation defines mastery.
Final Fantasy Tactics Advance leans Optimization (Pure Optimization); Final Fantasy X 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 Tactics Advance
Turn-based grid commands only
Final Fantasy X
Fully turn-based; zero time pressure on inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Final Fantasy Tactics Advance
Scripted opponents, judge rules are fixed
Final Fantasy X
All aeons and fiends operate on fixed AI scripts
Final Fantasy Tactics Advance leans a little harder on variance, though the gap is small.
Final Fantasy Tactics Advance
Random laws and hit rolls
Final Fantasy X
Minimal RNG in base game; overdrive gauge charges predictably
Final Fantasy X leans a little harder on optimization, though the gap is small.
Final Fantasy Tactics Advance
Race-job ability combos reward deep planning
Final Fantasy X
Sphere Grid routing and break damage limits make the game theoretically solvable
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.