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
An arcade test of jump timing and enemy-flipping precision on a single screen.

Execution · Pure Mechanics
A 3D platformer whose joy lives in tight movement and capture-driven traversal.
Mario Bros. 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 Bros.
Precise jumps and bump timing under crowding enemies decide survival
Super Mario Odyssey
Precise platforming and capture-move tech ceiling.
Mario Bros. leans a little harder on reads, though the gap is small.
Mario Bros.
Versus mode adds light human interference, enemies are scripted
Super Mario Odyssey
No adaptive opponents whatsoever.
Mario Bros. leans a little harder on variance, though the gap is small.
Mario Bros.
Enemy spawns vary slightly but patterns are quickly learned
Super Mario Odyssey
Almost no randomness in level design.
Super Mario Odyssey leans a little harder on optimization, though the gap is small.
Mario Bros.
POW block usage and enemy routing have known best lines
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.