head to head
Neither is simply harder - they are hard in different places. Mario & Sonic at the Olympic Games demands more reads; Super Mario Odyssey demands more optimization.

Execution · Pure Mechanics
A crossover Olympic sports collection where waggle timing and mashing form set the podium.

Execution · Pure Mechanics
A 3D platformer whose joy lives in tight movement and capture-driven traversal.
Mario & Sonic at the Olympic Games 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.
Mario & Sonic at the Olympic Games
Motion timing and mashing rhythm decide event results
Super Mario Odyssey
Precise platforming and capture-move tech ceiling.
Mario & Sonic at the Olympic Games leans clearly harder on reads.
Mario & Sonic at the Olympic Games
Human rivals race in parallel; little interaction
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.
Mario & Sonic at the Olympic Games
Events are fixed; almost no randomness
Super Mario Odyssey
Almost no randomness in level design.
Super Mario Odyssey leans clearly harder on optimization.
Mario & Sonic at the Olympic Games
Learning each event's optimal technique caps quickly
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.