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.

Optimization · Pure Optimization
A time-hopping JRPG sequel built on stagger combos, paradigm switching, and collecting tameable monsters.

Optimization · Pure Optimization
Steampunk colony defense against scripted zombie waves.
Final Fantasy XIII-2 leans Optimization (Pure Optimization); They Are Billions leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Final Fantasy XIII-2
Real-time paradigm shifts and QTEs need modest timing.
They Are Billions
some pause-based defense placement
They Are Billions leans a little harder on reads, though the gap is small.
Final Fantasy XIII-2
Boss behaviours are scripted and learnable.
They Are Billions
zombie AI not adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Final Fantasy XIII-2
Monster drops and timeline secrets until catalogued.
They Are Billions
map gen, swarm timing
They Are Billions leans a little harder on optimization, though the gap is small.
Final Fantasy XIII-2
Paradigm decks, monster builds, and stagger routing are the game.
They Are Billions
economy and wall placement 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.