head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

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

Variance · Light / Casual
A first-person psychological horror set in a cursed family home.
Iron Lung leans Variance (Light / Casual); Visage 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.
Iron Lung
Slow submarine piloting by coordinates
Visage
Slow movement and item use.
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
Visage
Ghosts follow scripted triggers.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Iron Lung
Blind navigation; you see only camera snapshots
Visage
Some scares and item placements vary.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Iron Lung
Plotting waypoints on the paper map
Visage
Sanity management is shallow.
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.