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
God game blending city building, creature training and conquering by awe or force.

Optimization · Pure Optimization
A streamlined click-along action RPG famous for its seamless world.
Black & White 2 leans Optimization (Pure Optimization); Dungeon Siege leans Optimization (Pure Optimization).
Black & White 2 leans a little harder on execution, though the gap is small.
Black & White 2
Gesture casting and creature handling need mild dexterity.
Dungeon Siege
Combat mostly resolves itself
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Black & White 2
Creature learning is trainable, not adversarially adaptive.
Dungeon Siege
Mobs charge on simple scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Black & White 2
Creature behaviour quirks add some unpredictability.
Dungeon Siege
Loot drops vary modestly
Black & White 2 leans a little harder on optimization, though the gap is small.
Black & White 2
City impressiveness versus army economy is the solvable choice.
Dungeon Siege
Party builds and pack-mule logistics are the 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.