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
A lighter loot ARPG of frontier adventurers with class relics and buildable forts.
Project Zomboid leans Optimization (Pure Optimization); Torchlight III 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.
Torchlight III
Simple skill rotation and dodging
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.
Torchlight III
Monsters are scripted fodder
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.
Torchlight III
Loot and map randomness standard for genre
Project Zomboid leans a little harder on optimization, though the gap is small.
Project Zomboid
Skill grinding, base setup, and routing define survival.
Torchlight III
Relic and skill builds, fort crafting bonuses
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.