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
A meta point-and-click comedy where you break the game's interface to play the game that isn't one.
Dungeon Siege leans Optimization (Pure Optimization); There Is No Game: Wrong Dimension 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
There Is No Game: Wrong Dimension
Pointing and clicking only
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
There Is No Game: Wrong Dimension
The narrator is scripted, not adaptive
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
There Is No Game: Wrong Dimension
Surprises hidden only until discovered
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
There Is No Game: Wrong Dimension
Fourth-wall puzzles have fixed solutions
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.