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 match-three game testing efficient board clearing to fund city-building.

Optimization · Pure Optimization
Lane-defense economy optimization against semi-randomised zombie waves.
Cradle of Rome leans Optimization (Pure Optimization); Plants vs. Zombies 2: It's About Time leans Optimization (Pure Optimization).
Cradle of Rome leans a little harder on execution, though the gap is small.
Cradle of Rome
Light click-speed under timers, never decisive
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.
Cradle of Rome
Solo match-three, no opponent to model
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.
Cradle of Rome
Board tile drops are random per move
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.
Cradle of Rome
Planning matches to collect resources builds the city
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.