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 · Practiced Mastery
Accessible car control amid demolition chaos rather than precision racing.

Execution · Pure Mechanics
Arcade soccer testing reflex tackles and super-shot timing.
Dirt Showdown leans Execution (Practiced Mastery); Nintendo World Cup 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.
Dirt Showdown
Drifting, boosting and ramming need solid car control
Nintendo World Cup
Tackles and super-shot timing decide most goals
Nintendo World Cup leans a little harder on reads, though the gap is small.
Dirt Showdown
Demolition modes reward predicting human movement a little
Nintendo World Cup
Versus a human, shot fakes add light prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dirt Showdown
Crash physics and pack chaos add randomness
Nintendo World Cup
Ball physics add minor chaos
Dirt Showdown leans a little harder on optimization, though the gap is small.
Dirt Showdown
Event types and boost routes are quickly learnable
Nintendo World Cup
Learning super-move triggers is a small solvable layer
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.