head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Pure Optimization
Optimising a dwarf fortress economy against a randomly generated world.

Optimization · Pure Optimization
Lane-defense economy optimization against semi-randomised zombie waves.
Craft the World leans Optimization (Pure Optimization); Plants vs. Zombies 2: It's About Time 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.
Craft the World
Indirect dwarf orders mean hands barely matter
Plants vs. Zombies 2: It's About Time
Tapping plants quickly only matters in surge moments
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Craft the World
Monster waves follow predictable scripted triggers
Plants vs. Zombies 2: It's About Time
Zombie waves are announced patterns, not minds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Craft the World
Random world generation hides resources until dug out
Plants vs. Zombies 2: It's About Time
Wave compositions and plant-food drops add per-level randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Craft the World
Fortress layout, tech tree and crafting chains are the real game
Plants vs. Zombies 2: It's About Time
Lawn economy and plant placement are the solvable core
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.