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 · Practiced Mastery
Horror about photographing ghosts at the last possible second inside a recurring dream manor.

Optimization · Practiced Mastery
Routing efficient digs and upgrades through a randomised mine.
Fatal Frame III: The Tormented leans Optimization (Practiced Mastery); SteamWorld Dig leans Optimization (Practiced Mastery).
Fatal Frame III: The Tormented leans a little harder on execution, though the gap is small.
Fatal Frame III: The Tormented
Fatal Frame shutter timing rewards held-nerve precision
SteamWorld Dig
Digging and platforming need modest precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fatal Frame III: The Tormented
Ghosts attack on scripted patterns
SteamWorld Dig
Enemies follow simple fixed patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fatal Frame III: The Tormented
Ghost spawns and dream-house layout surprise first run
SteamWorld Dig
Randomised mine layouts hide ore and hazards each run
Fatal Frame III: The Tormented leans a little harder on optimization, though the gap is small.
Fatal Frame III: The Tormented
Camera upgrades and ghost patterns fully converge
SteamWorld Dig
Upgrade routing and efficient dig paths drive progress
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.