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 · Pure Optimization
Team building and type-matchup optimization through a scripted island campaign.
Fallout Shelter leans Optimization (Pure Optimization); Pokémon Moon leans Optimization (Pure Optimization).
Pokémon Moon leans a little harder on execution, though the gap is small.
Fallout Shelter
Tapping menus only
Pokémon Moon
Turn-based menus require no dexterity
Pokémon Moon leans a little harder on reads, though the gap is small.
Fallout Shelter
No opponent
Pokémon Moon
Scripted trials and trainers; competitive play is a niche mode
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
Pokémon Moon
Encounter tables, catch rolls and crits are mappable RNG
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
Pokémon Moon
Team composition and type math are the solvable core
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.