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 hidden-object detective adventure testing fixed-puzzle deduction.

Optimization · Pure Optimization
A comedic point-and-click adventure of pirate puzzles with fixed solutions.
Enigmatis 3: The Shadow of Karkhala leans Optimization (Pure Optimization); Escape from 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.
Enigmatis 3: The Shadow of Karkhala
Point-and-click needs no motor precision
Escape from Monkey Island
Pointing and walking only
Enigmatis 3: The Shadow of Karkhala leans a little harder on reads, though the gap is small.
Enigmatis 3: The Shadow of Karkhala
Solo detective story; no adaptive opponent
Escape from Monkey Island
No opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Enigmatis 3: The Shadow of Karkhala
Hidden objects but fixed per-scene solutions
Escape from Monkey Island
Puzzle solutions hidden until discovered
Escape from Monkey Island leans a little harder on optimization, though the gap is small.
Enigmatis 3: The Shadow of Karkhala
Solving fixed puzzles and clue routing is the loop
Escape from Monkey Island
Once known, every puzzle has one fixed answer
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.