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

Optimization · Pure Optimization
Lane-defense economy optimization against semi-randomised zombie waves.

Optimization · Pure Optimization
A first-person farming game about wrangling adorable slimes for plorts.
Plants vs. Zombies 2: It's About Time leans Optimization (Pure Optimization); Slime Rancher 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.
Plants vs. Zombies 2: It's About Time
Tapping plants quickly only matters in surge moments
Slime Rancher
Vacuum aiming is gentle.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Plants vs. Zombies 2: It's About Time
Zombie waves are announced patterns, not minds
Slime Rancher
Slimes follow scripted behaviors.
Plants vs. Zombies 2: It's About Time leans a little harder on variance, though the gap is small.
Plants vs. Zombies 2: It's About Time
Wave compositions and plant-food drops add per-level randomness
Slime Rancher
Plort prices and slime spawns vary.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Plants vs. Zombies 2: It's About Time
Lawn economy and plant placement are the solvable core
Slime Rancher
Ranch layout and economy reward planning.
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.