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
A deep dual-class build system where optimising passive constellations and resist thresholds is the core challenge.

Optimization · Pure Optimization
Item-shop management sim where you set prices to pay off a fairy's loan.
Grim Dawn leans Optimization (Pure Optimization); Recettear: An Item Shop's Tale leans Optimization (Pure Optimization).
Grim Dawn leans a little harder on execution, though the gap is small.
Grim Dawn
Boss fights and Crucible have limited twitch demand
Recettear: An Item Shop's Tale
Light action combat in optional dungeon crawls.
Grim Dawn leans a little harder on reads, though the gap is small.
Grim Dawn
Solo and co-op PvE throughout; no adaptive opponent
Recettear: An Item Shop's Tale
Customer haggling follows mappable scripted tolerances.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grim Dawn
Drop RNG and component rolls add moderate hidden information
Recettear: An Item Shop's Tale
Market price swings and dungeon loot rolls.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Grim Dawn
Dual-class mastery system and devotion tree are extensively solvable
Recettear: An Item Shop's Tale
Pricing margins, stock, and debt schedule are nearly solvable.
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.