head to head
Neither is simply harder - they are hard in different places. Kick Off 2 demands more reads; Super Mario Odyssey demands more optimization.

Execution · Pure Mechanics
Famously unforgiving ball control tested against human prediction in fast matches.

Execution · Pure Mechanics
A 3D platformer whose joy lives in tight movement and capture-driven traversal.
Kick Off 2 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.
Kick Off 2
The ball never sticks - constant trapping demands famously precise control
Super Mario Odyssey
Precise platforming and capture-move tech ceiling.
Kick Off 2 leans clearly harder on reads.
Kick Off 2
Human matches reward predicting passes and tackle timing
Super Mario Odyssey
No adaptive opponents whatsoever.
Kick Off 2 leans a little harder on variance, though the gap is small.
Kick Off 2
Pitch types and deflections add mild chaos
Super Mario Odyssey
Almost no randomness in level design.
Super Mario Odyssey leans clearly harder on optimization.
Kick Off 2
Set plays and formation knowledge sit underneath
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.