head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Practiced Mastery
A forgiving kids' brawler whose depth is toy-combo and upgrade collecting.

Optimization · Practiced Mastery
A gag-driven platformer testing little beyond collectible patience.
Skylanders: Swap Force leans Optimization (Practiced Mastery); The Simpsons Game leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Skylanders: Swap Force
Simple brawling tuned for children's reflexes
The Simpsons Game
Simple platforming and character-power timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Skylanders: Swap Force
Enemies attack on basic scripts
The Simpsons Game
Parody enemies are jokes on rails
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Skylanders: Swap Force
Levels are fixed; only collectible spots are unknown once
The Simpsons Game
Levels are fixed gag sequences
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Skylanders: Swap Force
Figure combos, upgrades and collectible routing are the depth
The Simpsons Game
Character-ability puzzles and collectibles are lightly solvable
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.