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

Variance · Systems & Chaos
Pausable top-down heist game about improvising infiltrations of procedurally generated spaceships.

Optimization · Systems & Chaos
Managing RNG-driven combat while solving the underlying base economy and research tree.
Heat Signature leans Variance (Systems & Chaos); XCOM: Enemy Unknown 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.
Heat Signature
Pause tool removes most dexterity pressure
XCOM: Enemy Unknown
Turn-based; no twitch inputs; cover placement has mild precision
XCOM: Enemy Unknown leans a little harder on reads, though the gap is small.
Heat Signature
Guards follow simple mappable logic
XCOM: Enemy Unknown
Aliens follow scripted AI, never model your specific habits
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Heat Signature
Procedural ships, gear, and mission rolls
XCOM: Enemy Unknown
Hit chances, crit rolls, and mission spawns create constant RNG swings
XCOM: Enemy Unknown leans a little harder on optimization, though the gap is small.
Heat Signature
Gadget combos and improvised plan routing
XCOM: Enemy Unknown
Squad composition, research order, and base economy are solvable
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.