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

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

Optimization · Systems & Chaos
An FMV horror adventure where Gabriel Knight hunts a werewolf cult tied to mad king Ludwig II of Bavaria.
Fallout Shelter leans Optimization (Pure Optimization); The Beast Within: A Gabriel Knight Mystery 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
The Beast Within: A Gabriel Knight Mystery
Clicking through FMV scenes; nothing physical.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout Shelter
No opponent
The Beast Within: A Gabriel Knight Mystery
Werewolf cult actors follow a fixed script.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout Shelter
Incident spawns and lunchbox loot rolls
The Beast Within: A Gabriel Knight Mystery
Lycanthropy mystery conceals the truth until investigated.
Fallout Shelter leans a little harder on optimization, though the gap is small.
Fallout Shelter
Dweller stats and room layout are fully solvable
The Beast Within: A Gabriel Knight Mystery
Dual-protagonist investigation is a fixed solvable sequence.
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.