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

Execution · Pure Mechanics
High-speed trick execution along optimised lines down fixed mountains.

Execution · Pure Mechanics
A 3D platformer whose joy lives in tight movement and capture-driven traversal.
SSX leans Execution (Pure Mechanics); Super Mario Odyssey leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
SSX
Trick timing, landings and line control at speed are everything
Super Mario Odyssey
Precise platforming and capture-move tech ceiling.
SSX leans a little harder on reads, though the gap is small.
SSX
Rival AI racers are aggressive but mappable
Super Mario Odyssey
No adaptive opponents whatsoever.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
SSX
Courses are fixed once learned
Super Mario Odyssey
Almost no randomness in level design.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
SSX
Optimal trick lines and shortcut routing maximise score
Super Mario Odyssey
Moon routes and movement tech learnable.
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.