head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Optimization · Pure Optimization
A vault management sim about optimising dwellers, rooms, and resource loops.

Optimization · Systems & Chaos
A search-based detective game piecing together police interview footage.
Fallout Shelter leans Optimization (Pure Optimization); Her Story leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout Shelter
Tapping menus only
Her Story
Typing search terms only.
Her Story leans a little harder on reads, though the gap is small.
Fallout Shelter
No opponent
Her Story
Subject is recorded, not adaptive.
Her Story leans a little harder on variance, though the gap is small.
Fallout Shelter
Incident spawns and lunchbox loot rolls
Her Story
Hidden clips revealed by guessed keywords.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout Shelter
Dweller stats and room layout are fully solvable
Her Story
Efficient search strategy reconstructs the case.
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.