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

Execution · Light / Casual
A meditative underwater journey about swimming through gorgeous ocean vistas.

Variance · Light / Casual
A short psychological visual novel that tests nothing beyond attention and empathy.
ABZÛ leans Execution (Light / Casual); Milk Outside a Bag of Milk Outside a Bag of Milk leans Variance (Light / Casual).
ABZÛ leans a little harder on execution, though the gap is small.
ABZÛ
Gentle swimming controls, no fail states
Milk Outside a Bag of Milk Outside a Bag of Milk
Reading and choosing lines requires nothing physical
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
ABZÛ
No opponents at all
Milk Outside a Bag of Milk Outside a Bag of Milk
The girl's reactions are authored, not adaptive
Milk Outside a Bag of Milk Outside a Bag of Milk leans a little harder on variance, though the gap is small.
ABZÛ
Scripted reveals, minimal surprise
Milk Outside a Bag of Milk Outside a Bag of Milk
Branch outcomes are hidden on a first read
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
ABZÛ
Linear path, nothing to solve
Milk Outside a Bag of Milk Outside a Bag of Milk
Finding endings is light dialogue-tree exploration
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.