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
A haunting puzzle-strategy game testing combo planning against rule-driven mortals.

Optimization · Pure Optimization
Lane defense classic about managing a sun economy against shambling waves.
Ghost Master leans Optimization (Pure Optimization); Plants vs. Zombies 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.
Ghost Master
Assigning ghosts to fetters needs no dexterity
Plants vs. Zombies
Clicking to plant, minimal pressure
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Ghost Master
Mortal AI panics by rules, not by modelling you
Plants vs. Zombies
Zombie waves follow set compositions
Plants vs. Zombies leans a little harder on variance, though the gap is small.
Ghost Master
Mortal behaviour wanders but follows mappable logic
Plants vs. Zombies
Wave timing and lane pressure vary mildly
Plants vs. Zombies leans a little harder on optimization, though the gap is small.
Ghost Master
Ghost-power combos and plasm economy solve each haunting
Plants vs. Zombies
Sun economy and lane setups are near-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.