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
Testing how precisely you can swing a Move controller across six sports.

Execution · Pure Mechanics
Motion-controlled tennis, bowling, golf, baseball and boxing built around simple swing gestures.
Sports Champions 2 leans Execution (Pure Mechanics); Wii Sports leans Execution (Pure Mechanics).
Sports Champions 2 leans a little harder on execution, though the gap is small.
Sports Champions 2
Motion-controlled swings and punches reward physical precision
Wii Sports
Motion swing timing and accuracy decide every event
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Sports Champions 2
Local rivals can be baited in boxing or tennis, lightly
Wii Sports
Casual local opponents add light mind games
Wii Sports leans a little harder on variance, though the gap is small.
Sports Champions 2
Events are deterministic given your motion
Wii Sports
Minor physics wobble and CPU behaviour randomness
Wii Sports leans a little harder on optimization, though the gap is small.
Sports Champions 2
Technique tips exist but systems stay shallow
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.