head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Pure Mechanics
Arcade soccer brawling where quick inputs and special-shot setups beat tactics.

Execution · Pure Mechanics
Motion-controlled tennis, bowling, golf, baseball and boxing built around simple swing gestures.
Kunio-kun's Nekketsu Soccer League leans Execution (Pure Mechanics); Wii Sports 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.
Kunio-kun's Nekketsu Soccer League
Special shots, tackles and positioning need quick hands
Wii Sports
Motion swing timing and accuracy decide every event
Kunio-kun's Nekketsu Soccer League leans a little harder on reads, though the gap is small.
Kunio-kun's Nekketsu Soccer League
Versus a friend, faking shots and tackles adds prediction
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.
Kunio-kun's Nekketsu Soccer League
Weather and wacky physics add mild chaos
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.
Kunio-kun's Nekketsu Soccer League
Team picks and shot setups have learnable best answers
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.