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.

Execution · Practiced Mastery
Moderate platforming execution through inventive but fixed mental levels.

Execution · Practiced Mastery
An open-zone Sonic experiment with cyberspace stages.
Psychonauts leans Execution (Practiced Mastery); Sonic Frontiers leans Execution (Practiced Mastery).
Psychonauts leans a little harder on execution, though the gap is small.
Psychonauts
Platforming and psychic combat need moderate precision
Sonic Frontiers
Boost-running and combat at speed
Sonic Frontiers leans a little harder on reads, though the gap is small.
Psychonauts
Mental-world enemies follow fixed behaviours
Sonic Frontiers
Scripted enemies
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Psychonauts
Level layouts are fixed and quickly known
Sonic Frontiers
Static open zones
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Psychonauts
Collectible routing and power upgrades add light planning
Sonic Frontiers
Skill tree and stat farming
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.