head to head
Neither is simply harder - they are hard in different places. Super Mario Odyssey demands more execution; Wii Sports Resort demands more reads.

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

Execution · Pure Mechanics
Island-themed collection of twelve motion-controlled sports showcasing the Wii MotionPlus accessory.
Super Mario Odyssey leans Execution (Pure Mechanics); Wii Sports Resort leans Execution (Pure Mechanics).
Super Mario Odyssey leans clearly harder on execution.
Super Mario Odyssey
Precise platforming and capture-move tech ceiling.
Wii Sports Resort
MotionPlus precision in swordplay, archery and bowling
Wii Sports Resort leans clearly harder on reads.
Super Mario Odyssey
No adaptive opponents whatsoever.
Wii Sports Resort
Local versus duels involve mild feinting
Wii Sports Resort leans a little harder on variance, though the gap is small.
Super Mario Odyssey
Almost no randomness in level design.
Wii Sports Resort
Slight physics and CPU pattern randomness
Super Mario Odyssey leans clearly harder on optimization.
Super Mario Odyssey
Moon routes and movement tech learnable.
Wii Sports Resort
Each event has small learnable technique optima
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.