head to head
Neither is simply harder - they are hard in different places. Fighting Force demands more execution; The Simpsons Wrestling demands more reads.

Execution · Practiced Mastery
A straightforward brawler testing crowd management with basic timing.

Execution · Light / Casual
A shallow mashy wrestler where exploiting janky moves beats any deep skill.
Fighting Force leans Execution (Practiced Mastery); The Simpsons Wrestling leans Execution (Light / Casual).
Fighting Force leans clearly harder on execution.
Fighting Force
Crowd control and weapon swings need basic timing
The Simpsons Wrestling
Mashy controls with little precision to reward
The Simpsons Wrestling leans clearly harder on reads.
Fighting Force
Enemy waves attack in fixed patterns
The Simpsons Wrestling
Versus humans involves light habit-reading
The Simpsons Wrestling leans a little harder on variance, though the gap is small.
Fighting Force
Levels and pickups are static
The Simpsons Wrestling
Janky collision adds accidental randomness
Fighting Force leans a little harder on optimization, though the gap is small.
Fighting Force
Route choices and weapon use are shallow systems
The Simpsons Wrestling
Each character's spam-able power move is quickly found
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.