head to head
Neither is simply harder - they are hard in different places. Fruit Ninja demands more variance; Super Mario Odyssey demands more optimization.

Execution · Pure Mechanics
A swipe-em-up arcade game where slicing accuracy against random fruit spawns is the whole skill.

Execution · Pure Mechanics
A 3D platformer whose joy lives in tight movement and capture-driven traversal.
Fruit Ninja leans Execution (Pure Mechanics); Super Mario Odyssey leans Execution (Pure Mechanics).
Super Mario Odyssey leans a little harder on execution, though the gap is small.
Fruit Ninja
Swipe accuracy and combo timing
Super Mario Odyssey
Precise platforming and capture-move tech ceiling.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fruit Ninja
No opponent
Super Mario Odyssey
No adaptive opponents whatsoever.
Fruit Ninja leans clearly harder on variance.
Fruit Ninja
Random fruit and bomb spawns
Super Mario Odyssey
Almost no randomness in level design.
Super Mario Odyssey leans clearly harder on optimization.
Fruit Ninja
Combo and crit systems are shallow but real
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.