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 · Systems & Chaos
A short first-person horror game testing nerve against scripted home invasion scares.

Variance · Light / Casual
Claustrophobic horror short about piloting a blind submarine through a blood ocean.
Evil leans Variance (Systems & Chaos); 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.
Evil
Walking and looking; minimal physical demand
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.
Evil
Scare events are scripted, not an adaptive mind
Iron Lung
The thing outside follows a script
Evil leans a little harder on variance, though the gap is small.
Evil
Hidden scares and events drive the unknown tension
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.
Evil
Figuring out what to do next is the small loop
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.