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

Optimization · Pure Optimization
A hidden-object adventure about solving fixed puzzles to follow a Norse mystery.

Optimization · Pure Optimization
Linear JRPG built around real-time paradigm switching and stagger combat.
Endless Fables 2: Frozen Path leans Optimization (Pure Optimization); Final Fantasy XIII leans Optimization (Pure Optimization).
Final Fantasy XIII leans a little harder on execution, though the gap is small.
Endless Fables 2: Frozen Path
Point-and-click and hidden-object hunting, no dexterity
Final Fantasy XIII
Paradigm shifts need timely menu reactions
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Endless Fables 2: Frozen Path
No adaptive opponent in solo adventure
Final Fantasy XIII
Scripted stagger-phase bosses
Final Fantasy XIII leans a little harder on variance, though the gap is small.
Endless Fables 2: Frozen Path
Puzzles and scenes are fixed
Final Fantasy XIII
Minor randomness in enemy actions
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Endless Fables 2: Frozen Path
Solving inventory puzzles and finding objects is the loop
Final Fantasy XIII
Paradigm sequencing and stagger timing are 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.