head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

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

Optimization · Pure Optimization
A mechanical journey adventure solved by understanding the logic of its automaton-filled world.
Endless Fables 2: Frozen Path leans Optimization (Pure Optimization); Syberia 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.
Endless Fables 2: Frozen Path
Point-and-click and hidden-object hunting, no dexterity
Syberia
Walking and clicking; zero reflex demand
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
Syberia
NPCs follow scripted dialogue trees with no adaptive modelling
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Endless Fables 2: Frozen Path
Puzzles and scenes are fixed
Syberia
Linear journey with virtually no hidden-information surprises
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
Syberia
Mechanical clockwork puzzles require mapping part relationships
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.