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

Optimization · Pure Optimization
A sarcastic British comedy adventure where a teenage wizard rescues an old sorcerer from an evil rival.

Optimization · Pure Optimization
Comedic point-and-click adventure of Guybrush Threepwood, hand-drawn at its peak.
Simon the Sorcerer leans Optimization (Pure Optimization); The Curse of 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.
Simon the Sorcerer
Verb-and-click; zero reflex requirement.
The Curse of Monkey Island
pointing and clicking only
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Simon the Sorcerer
Fantasy parodies are static set dressing.
The Curse of Monkey Island
no adaptive opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Simon the Sorcerer
Some obscure item uses surprise first playthroughs.
The Curse of Monkey Island
puzzle solutions unknown on first play, then fixed
The Curse of Monkey Island leans a little harder on optimization, though the gap is small.
Simon the Sorcerer
Classic inventory puzzle chains with fixed solutions.
The Curse of Monkey Island
inventory logic puzzles are fully 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.