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 · Pure Mechanics
A 3D platformer whose joy lives in tight movement and capture-driven traversal.

Execution · Pure Mechanics
A tilt-control balance game about rolling precisely through floating mazes.
Super Mario Odyssey leans Execution (Pure Mechanics); Super Monkey Ball 3D leans Execution (Pure Mechanics).
Super Monkey Ball 3D leans a little harder on execution, though the gap is small.
Super Mario Odyssey
Precise platforming and capture-move tech ceiling.
Super Monkey Ball 3D
Precise tilt control under gravity is the entire test
Super Monkey Ball 3D leans a little harder on reads, though the gap is small.
Super Mario Odyssey
No adaptive opponents whatsoever.
Super Monkey Ball 3D
Solo stages, no opponent to predict
Super Monkey Ball 3D leans a little harder on variance, though the gap is small.
Super Mario Odyssey
Almost no randomness in level design.
Super Monkey Ball 3D
Levels are fixed with little randomness
Super Mario Odyssey leans a little harder on optimization, though the gap is small.
Super Mario Odyssey
Moon routes and movement tech learnable.
Super Monkey Ball 3D
Optimal lines through mazes reward route learning
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.