head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

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

Execution · Practiced Mastery
Mid-demand 3D platforming execution across fixed gravity puzzles.
Psychonauts leans Execution (Practiced Mastery); Super Mario Galaxy leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Psychonauts
Platforming and psychic combat need moderate precision
Super Mario Galaxy
Gravity-bending jumps need timing, though forgiving by Mario standards
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Psychonauts
Mental-world enemies follow fixed behaviours
Super Mario Galaxy
Bosses repeat fixed patterns - nothing adapts
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
Super Mario Galaxy
Galaxies are scripted; surprises evaporate after one visit
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
Super Mario Galaxy
Star routes and comet challenges reward learned 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.