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
Farm scheduling and economy optimisation across seasons and relationships.

Optimization · Pure Optimization
Methodically dissecting intricate puzzle boxes whose mechanisms are fully solvable.
Harvest Moon DS leans Optimization (Pure Optimization); The Room Three 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.
Harvest Moon DS
Daily chores have no twitch component
The Room Three
Rotating and prodding mechanisms takes no dexterity
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Harvest Moon DS
Villagers run fixed schedules, never adapt
The Room Three
The Craftsman is narrative dressing, not an adaptive mind
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Harvest Moon DS
Weather, festivals and sprite unlocks hide some information
The Room Three
Hidden mechanisms are unknown until inspected, then fixed
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Harvest Moon DS
Crop rotations, scheduling and money loops are the whole game
The Room Three
Each puzzle box is a fully solvable mechanical system
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.