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 surreal escape room testing deduction of hidden item-and-puzzle chains.

Optimization · Pure Optimization
Comedic point-and-click adventure of Guybrush Threepwood, hand-drawn at its peak.
Cube Escape: Birthday 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.
Cube Escape: Birthday
Pointing and clicking, zero dexterity
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.
Cube Escape: Birthday
Fully scripted scenes, nothing adapts
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.
Cube Escape: Birthday
Puzzle logic is hidden until items are discovered
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.
Cube Escape: Birthday
Each surreal puzzle has one fixed solvable answer
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.