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

Variance · Systems & Chaos
Map-and-compass navigation through hidden dangers on a hostile mountain.

Variance · Systems & Chaos
Navigating unseen spaces by sound while rationing the noise that summons danger.
Kholat leans Variance (Systems & Chaos); Perception 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.
Kholat
Walking the mountain takes no dexterity
Perception
Echolocation taps and walking ask little of the hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kholat
The presence stalks on randomised triggers, not a mind
Perception
The Presence triggers on scripted noise thresholds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Kholat
Navigating by map coordinates with hidden danger zones
Perception
Blind navigation makes layouts hidden information at first
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Kholat
Landmark navigation and route memory converge with repetition
Perception
Managing noise and learning routes converges quickly
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.