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 puzzle-forward adventure testing creative lateral thinking against a fixed authored solution space.
Endless Fables 2: Frozen Path leans Optimization (Pure Optimization); Return to Monkey Island 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
Return to Monkey Island
Modern hint system and relaxed interface remove all reflex demands
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
Return to Monkey Island
Entirely authored puzzles with no adaptive opponent
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
Return to Monkey Island
Virtually no randomness; solutions are static
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
Return to Monkey Island
Lateral-thinking item puzzles require mapping cause and effect chains
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.