head to head
vs
Chaos Zero NightmarevsFallout Shelter
Chaos Zero Nightmare leans Optimization (Systems & Chaos); Fallout Shelter leans Optimization (Pure Optimization).
Chaos Zero NightmareFallout Shelter
Axis by axis
Execution1 vs 0
Chaos Zero Nightmare leans harder on execution: Turn-based menus carry no physical demand
Reads0 vs 0
Even - both lean on reads about the same.
Variance5 vs 4
Chaos Zero Nightmare leans harder on variance: Gacha pulls and run events gate options
Optimization7 vs 7
Even - both lean on optimization about the same.
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.