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 · Systems & Chaos
A stealth horror where an unpredictable hunter forces hidden-information play.

Variance · Systems & Chaos
The harder sequel that swaps doors for a mask and forces a frantic multitasking routine against more animatronics.
Alien: Isolation leans Variance (Systems & Chaos); Five Nights at Freddy's 2 leans Variance (Systems & Chaos).
Five Nights at Freddy's 2 leans a little harder on execution, though the gap is small.
Alien: Isolation
Stealth movement, low mechanical bar
Five Nights at Freddy's 2
Mask, flashlight, and music box juggling demands fast hands
Alien: Isolation leans a little harder on reads, though the gap is small.
Alien: Isolation
Alien has heuristics but doesn't truly model you
Five Nights at Freddy's 2
RNG-driven animatronics, not adaptive opponents
Alien: Isolation leans a little harder on variance, though the gap is small.
Alien: Isolation
Alien's director behavior is hidden and unpredictable
Five Nights at Freddy's 2
More stalkers, more hidden movement rolls
Five Nights at Freddy's 2 leans a little harder on optimization, though the gap is small.
Alien: Isolation
Resource crafting and route planning help survive
Five Nights at Freddy's 2
Optimal check rotations make late nights 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.