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

Optimization · Pure Optimization
A cozy island life-sim about building a community at your pace.

Optimization · Pure Optimization
God game about winning worshippers through miracles and training a giant pet creature.
Animal Crossing: New Horizons leans Optimization (Pure Optimization); Black & White 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.
Animal Crossing: New Horizons
Trivial inputs.
Black & White
Gesture-cast miracles; minimal dexterity stakes
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Animal Crossing: New Horizons
NPCs are scripted.
Black & White
Rival gods follow scripted strategies
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Animal Crossing: New Horizons
Daily visitors and fossils randomize.
Black & White
Creature learning quirks surprise first plays
Black & White leans a little harder on optimization, though the gap is small.
Animal Crossing: New Horizons
Turnips, layout, and time-routing reward planning.
Black & White
Village economy, belief spread, and creature training
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.