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
A rail shooter testing aim and reflexes through scripted space battles.

Execution · Pure Mechanics
Motion-controlled tennis, bowling, golf, baseball and boxing built around simple swing gestures.
Star Wars Arcade leans Execution (Pure Mechanics); Wii Sports leans Execution (Pure Mechanics).
Star Wars Arcade leans a little harder on execution, though the gap is small.
Star Wars Arcade
Aiming and dodging in rail combat decides survival
Wii Sports
Motion swing timing and accuracy decide every event
Wii Sports leans a little harder on reads, though the gap is small.
Star Wars Arcade
Enemy ships follow scripted attack patterns
Wii Sports
Casual local opponents add light mind games
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Star Wars Arcade
Minor variation in enemy approaches
Wii Sports
Minor physics wobble and CPU behaviour randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Star Wars Arcade
Memorizing waves and conserving shields helps
Wii Sports
Simple technique tricks like bowling spin are 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.