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.

Optimization · Systems & Chaos
A freemium town builder testing patience and timer scheduling more than any skill.

Optimization · Light / Casual
A gorgeous first-person mystery about piecing together a boy's disappearance.
The Simpsons: Tapped Out leans Optimization (Systems & Chaos); The Vanishing of Ethan Carter leans Optimization (Light / Casual).
The Vanishing of Ethan Carter leans a little harder on execution, though the gap is small.
The Simpsons: Tapped Out
Tapping buildings has no skill component
The Vanishing of Ethan Carter
Walking and looking, nothing more
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
The Simpsons: Tapped Out
No opponent in a solo town builder
The Vanishing of Ethan Carter
No opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
The Simpsons: Tapped Out
Event prize rolls add mild randomness
The Vanishing of Ethan Carter
The mystery is hidden only until discovered
The Simpsons: Tapped Out leans a little harder on optimization, though the gap is small.
The Simpsons: Tapped Out
Task scheduling and payout timing are the only decisions
The Vanishing of Ethan Carter
Reconstructing event sequences is light deduction
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.