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
God game about winning worshippers through miracles and training a giant pet creature.

Optimization · Pure Optimization
Farm scheduling and economy optimisation across seasons and relationships.
Black & White leans Optimization (Pure Optimization); Harvest Moon DS 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.
Black & White
Gesture-cast miracles; minimal dexterity stakes
Harvest Moon DS
Daily chores have no twitch component
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Black & White
Rival gods follow scripted strategies
Harvest Moon DS
Villagers run fixed schedules, never adapt
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Black & White
Creature learning quirks surprise first plays
Harvest Moon DS
Weather, festivals and sprite unlocks hide some information
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Black & White
Village economy, belief spread, and creature training
Harvest Moon DS
Crop rotations, scheduling and money loops are the whole game
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.