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.

Optimization · Pure Optimization
Dystopian management adventure about a landlord spying on tenants for a totalitarian state.

Optimization · Pure Optimization
A vault management sim about optimising dwellers, rooms, and resource loops.
Beholder leans Optimization (Pure Optimization); Fallout Shelter leans Optimization (Pure Optimization).
Beholder leans a little harder on execution, though the gap is small.
Beholder
Simple point-and-click landlord actions
Fallout Shelter
Tapping menus only
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Beholder
Tenants follow scripted schedules, not adaptive
Fallout Shelter
No opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Beholder
Tenant events and directives surprise first runs
Fallout Shelter
Incident spawns and lunchbox loot rolls
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Beholder
Money, time, and blackmail decision routing
Fallout Shelter
Dweller stats and room layout are fully 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.