head to head
Fallout SheltervsReigns: Her Majesty
Fallout Shelter leans Optimization (Pure Optimization); Reigns: Her Majesty leans Optimization (Systems & Chaos).
Fallout ShelterReigns: Her Majesty
Axis by axis
Execution0 vs 0
Even - both lean on execution about the same.
Reads0 vs 0
Even - both lean on reads about the same.
Variance4 vs 5
Reigns: Her Majesty leans harder on variance: Card draws and unknown consequences drive each reign's fate
Optimization7 vs 6
Fallout Shelter leans harder on optimization: Dweller stats and room layout are fully solvable
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.

