head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Practiced Mastery
Build optimization and learned monster weak points, executed through physical climb-and-strike combat.

Optimization · Practiced Mastery
Hybrid tower-defense testing maze optimization backed by first-person aim.
Dragon's Dogma: Dark Arisen leans Optimization (Practiced Mastery); Sanctum 2 leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon's Dogma: Dark Arisen
Climbing monsters and timing skills demands real combat dexterity
Sanctum 2
Weak-point shooting during waves carries real aim demands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon's Dogma: Dark Arisen
Pawns and monsters follow learnable scripted behaviours
Sanctum 2
Alien waves path predictably toward the core
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon's Dogma: Dark Arisen
Bitterblack loot rolls and night spawns add managed randomness
Sanctum 2
Wave compositions vary mildly between maps
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon's Dogma: Dark Arisen
Vocation builds, augment stacking and monster weak-point knowledge dominate
Sanctum 2
Maze layouts and tower economics are the solvable heart
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.