head to head
Neither is simply harder - they are hard in different places. Super Mario Odyssey demands more optimization; Virtua Tennis 4 demands more reads.

Execution · Pure Mechanics
A 3D platformer whose joy lives in tight movement and capture-driven traversal.

Execution · Pure Mechanics
An arcade tennis game rewarding precise timing and reading human opponents.
Super Mario Odyssey leans Execution (Pure Mechanics); Virtua Tennis 4 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.
Super Mario Odyssey
Precise platforming and capture-move tech ceiling.
Virtua Tennis 4
precise shot timing and positioning
Virtua Tennis 4 leans clearly harder on reads.
Super Mario Odyssey
No adaptive opponents whatsoever.
Virtua Tennis 4
human opponents can be out-predicted in rallies
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Super Mario Odyssey
Almost no randomness in level design.
Virtua Tennis 4
minor ball-bounce randomness
Super Mario Odyssey leans clearly harder on optimization.
Super Mario Odyssey
Moon routes and movement tech learnable.
Virtua Tennis 4
minimal build depth, mostly play skill
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.