head to head
Batman: Arkham City asks more than The Simpsons Game, and the gap is execution.

Execution · Practiced Mastery
An open-city sequel deepening freeflow combat and predator gadget play.

Optimization · Practiced Mastery
A gag-driven platformer testing little beyond collectible patience.
Batman: Arkham City leans Execution (Practiced Mastery); The Simpsons Game leans Optimization (Practiced Mastery).
Batman: Arkham City leans clearly harder on execution.
Batman: Arkham City
Combo chains and counters need timing.
The Simpsons Game
Simple platforming and character-power timing
Batman: Arkham City leans a little harder on reads, though the gap is small.
Batman: Arkham City
Enemies scripted, not adaptive.
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.
Batman: Arkham City
Fixed encounters and challenges.
The Simpsons Game
Levels are fixed gag sequences
Batman: Arkham City leans a little harder on optimization, though the gap is small.
Batman: Arkham City
Gadget combos and challenge maps learnable.
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.