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

Variance · Light / Casual
Claustrophobic horror short about piloting a blind submarine through a blood ocean.

Variance · Systems & Chaos
A cinematic horror story on a ghost ship where choices and QTEs decide who survives.
Iron Lung leans Variance (Light / Casual); The Dark Pictures Anthology: Man of Medan leans Variance (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Iron Lung
Slow submarine piloting by coordinates
The Dark Pictures Anthology: Man of Medan
QTEs and heartbeat prompts need basic timing.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Iron Lung
The thing outside follows a script
The Dark Pictures Anthology: Man of Medan
No adaptive opponent; horrors are scripted.
The Dark Pictures Anthology: Man of Medan leans a little harder on variance, though the gap is small.
Iron Lung
Blind navigation; you see only camera snapshots
The Dark Pictures Anthology: Man of Medan
Hidden branching consequences until the routes are mapped.
The Dark Pictures Anthology: Man of Medan leans a little harder on optimization, though the gap is small.
Iron Lung
Plotting waypoints on the paper map
The Dark Pictures Anthology: Man of Medan
Once branches are known, keeping everyone alive is 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.