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

Optimization · Systems & Chaos
A fairy-tale adventure testing patient discovery of fixed puzzle solutions.
Fallout Shelter leans Optimization (Pure Optimization); The Night of the Rabbit leans Optimization (Systems & Chaos).
The Night of the Rabbit leans a little harder on execution, though the gap is small.
Fallout Shelter
Tapping menus only
The Night of the Rabbit
Pointing and clicking has no motor ceiling
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 Night of the Rabbit
No opponent of any kind to predict
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 Night of the Rabbit
Puzzle solutions are hidden information until discovered
Fallout Shelter leans a little harder on optimization, though the gap is small.
Fallout Shelter
Dweller stats and room layout are fully solvable
The Night of the Rabbit
A walkthrough trivialises it - puzzles have fixed solutions
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.