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

Execution · Pure Mechanics
Arcade run-and-gun whose one-credit clears demand total spawn memorization and twitch.

Execution · Pure Mechanics
A 3D platformer whose joy lives in tight movement and capture-driven traversal.
Metal Slug 3 leans Execution (Pure Mechanics); Super Mario Odyssey leans Execution (Pure Mechanics).
Metal Slug 3 leans a little harder on execution, though the gap is small.
Metal Slug 3
one-hit deaths demand frame-level dodging and aim
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.
Metal Slug 3
every enemy wave is scripted
Super Mario Odyssey
No adaptive opponents whatsoever.
Metal Slug 3 leans a little harder on variance, though the gap is small.
Metal Slug 3
branching paths vary runs slightly
Super Mario Odyssey
Almost no randomness in level design.
Metal Slug 3 leans a little harder on optimization, though the gap is small.
Metal Slug 3
memorizing spawns is the path to a one-credit clear
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.