head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Optimization · Pure Optimization
Noir DS adventure about interrogating hotel guests to unpick a mystery.

Optimization · Systems & Chaos
Notorious FMV horror adventure of a writer unraveling her mansion's grisly past.
Hotel Dusk: Room 215 leans Optimization (Pure Optimization); Phantasmagoria leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Hotel Dusk: Room 215
Stylus puzzles need negligible dexterity
Phantasmagoria
Point-and-click with rare timed scenes
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Hotel Dusk: Room 215
Characters follow a fixed narrative script
Phantasmagoria
Horror beats are fully scripted
Phantasmagoria leans a little harder on variance, though the gap is small.
Hotel Dusk: Room 215
Story info hidden until questioned out
Phantasmagoria
Deaths and triggers unknown on first run
Hotel Dusk: Room 215 leans a little harder on optimization, though the gap is small.
Hotel Dusk: Room 215
Choosing right dialogue and solving set puzzles
Phantasmagoria
Linear puzzle chains with single 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.