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
The 1986 original that founded the Japanese RPG template.

Optimization · Pure Optimization
A streamlined click-along action RPG famous for its seamless world.
Dragon Quest leans Optimization (Pure Optimization); Dungeon Siege leans Optimization (Pure Optimization).
Dungeon Siege leans a little harder on execution, though the gap is small.
Dragon Quest
Menu commands only
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.
Dragon Quest
No adaptive opposition
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.
Dragon Quest
Battle RNG and unknown world first time
Dungeon Siege
Loot drops vary modestly
Dragon Quest leans a little harder on optimization, though the gap is small.
Dragon Quest
Grind thresholds and routes are fully solvable
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.