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 streamlined click-along action RPG famous for its seamless world.

Optimization · Pure Optimization
Hunting hidden objects and solving puzzles through a fixed mystery narrative.
Dungeon Siege leans Optimization (Pure Optimization); Mystery Case Files: Fate's Carnival 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
Combat mostly resolves itself
Mystery Case Files: Fate's Carnival
Clicking objects has no twitch demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dungeon Siege
Mobs charge on simple scripts
Mystery Case Files: Fate's Carnival
Solo with no opponent to model
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dungeon Siege
Loot drops vary modestly
Mystery Case Files: Fate's Carnival
Hidden objects are fixed, just unfound until searched
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dungeon Siege
Party builds and pack-mule logistics are the game
Mystery Case Files: Fate's Carnival
Solving puzzles and finding items is the entire loop
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.