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
A party-based loot ARPG marching a customizable squad across Aranna against Valdis.

Optimization · Pure Optimization
A breezy dungeon-crawling loot game about builds and ever-better randomized gear.
Dungeon Siege II leans Optimization (Pure Optimization); Torchlight 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.
Dungeon Siege II
Party combat mostly automates itself
Torchlight
Click-to-kill combat with minimal mechanical demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dungeon Siege II
Enemies follow simple scripts
Torchlight
Solo dungeon crawl, no adaptive opposition
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dungeon Siege II
Random loot and chant rewards
Torchlight
Randomized loot and dungeon layouts gate power
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dungeon Siege II
Party composition, pet raising, skill tree planning
Torchlight
Build paths and gear stats are the real 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.