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 · Competitive PvP
Wii U minigame park whose asymmetric hide-and-seek modes shine with friends.

Execution · Light / Casual
A shallow mashy wrestler where exploiting janky moves beats any deep skill.
Nintendo Land leans Execution (Competitive PvP); The Simpsons Wrestling leans Execution (Light / Casual).
Nintendo Land leans a little harder on execution, though the gap is small.
Nintendo Land
Motion and GamePad dexterity across minigames
The Simpsons Wrestling
Mashy controls with little precision to reward
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Nintendo Land
Asymmetric chase games create real human mind-games
The Simpsons Wrestling
Versus humans involves light habit-reading
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Nintendo Land
Some random layouts and item spawns
The Simpsons Wrestling
Janky collision adds accidental randomness
Nintendo Land leans a little harder on optimization, though the gap is small.
Nintendo Land
Per-attraction tactics, mostly shallow
The Simpsons Wrestling
Each character's spam-able power move is quickly found
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.