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 zombie survival sim where long-term planning outweighs moment-to-moment skill.

Optimization · Systems & Chaos
An inspection-procedure test of judging hidden infections under base-building pressure.
Project Zomboid leans Optimization (Pure Optimization); Quarantine Zone: The Last Check leans Optimization (Systems & Chaos).
Project Zomboid leans a little harder on execution, though the gap is small.
Project Zomboid
Combat is deliberate; precision matters but is slow.
Quarantine Zone: The Last Check
Inspecting survivors and managing defenses needs no dexterity
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Project Zomboid
Zombies follow scripted behaviour; no adaptation.
Quarantine Zone: The Last Check
Survivors are generated cases, not adapting deceivers
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Project Zomboid
Loot spawns and zombie distributions randomized.
Quarantine Zone: The Last Check
Each arrival's infection status is hidden until inspected
Project Zomboid leans a little harder on optimization, though the gap is small.
Project Zomboid
Skill grinding, base setup, and routing define survival.
Quarantine Zone: The Last Check
Mastering inspection rules and base economy converges to procedure
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.