head to head
Neither is simply harder - they are hard in different places. Air-Sea Battle demands more reads; Super Mario Odyssey demands more optimization.

Execution · Pure Mechanics
A 1977 timing test - lead the moving target and outscore the other gun.

Execution · Pure Mechanics
A 3D platformer whose joy lives in tight movement and capture-driven traversal.
Air-Sea Battle leans Execution (Pure Mechanics); Super Mario Odyssey leans Execution (Pure Mechanics).
Super Mario Odyssey leans clearly harder on execution.
Air-Sea Battle
Timing shots on moving targets is the entire game
Super Mario Odyssey
Precise platforming and capture-move tech ceiling.
Air-Sea Battle leans clearly harder on reads.
Air-Sea Battle
Head-to-head play adds slight outguessing of the other gunner
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.
Air-Sea Battle
Target patterns cycle predictably
Super Mario Odyssey
Almost no randomness in level design.
Super Mario Odyssey leans clearly harder on optimization.
Air-Sea Battle
Learning target speeds and angles is 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.