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 bureaucratic scheduling, bribery and sabotage inside an authored dystopia.

Optimization · Pure Optimization
God game about winning worshippers through miracles and training a giant pet creature.
Beholder 2 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.
Beholder 2
Clicking through tasks and minigames needs no dexterity
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.
Beholder 2
Coworkers and citizens follow authored scripts
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.
Beholder 2
Document details and event outcomes hide information
Black & White
Creature learning quirks surprise first plays
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Beholder 2
Scheduling work, bribes and career sabotage is solvable strategy
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.