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.

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

Execution · Light / Casual
A psychological survival horror game where atmosphere and puzzle-solving matter more than combat.
Iron Lung leans Variance (Light / Casual); Silent Hill 2 leans Execution (Light / Casual).
Silent Hill 2 leans a little harder on execution, though the gap is small.
Iron Lung
Slow submarine piloting by coordinates
Silent Hill 2
clunky combat with modest execution demand
Silent Hill 2 leans a little harder on reads, though the gap is small.
Iron Lung
The thing outside follows a script
Silent Hill 2
enemies scripted, not truly adaptive
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
Silent Hill 2
fog and enemy placement randomness
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
Silent Hill 2
puzzle logic and resource use are 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.