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.

Optimization · Light / Casual
A branching story that tests choice exploration more than any skill.

Variance · Light / Casual
Claustrophobic horror short about piloting a blind submarine through a blood ocean.
Detroit: Become Human leans Optimization (Light / Casual); Iron Lung leans Variance (Light / Casual).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Detroit: Become Human
Quick-time events demand only basic reaction timing
Iron Lung
Slow submarine piloting by coordinates
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Detroit: Become Human
Branching script, no adaptive adversary
Iron Lung
The thing outside follows a script
Iron Lung leans a little harder on variance, though the gap is small.
Detroit: Become Human
Branch consequences are hidden information until explored
Iron Lung
Blind navigation; you see only camera snapshots
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Detroit: Become Human
Flowchart completion is a light solvable puzzle
Iron Lung
Plotting waypoints on the paper map
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.