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

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

Execution · Practiced Mastery
MMO street racing testing driving lines plus grindable car-build advantage.
Dirt Showdown leans Execution (Practiced Mastery); Need for Speed: World leans Execution (Practiced Mastery).
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
Need for Speed: World
Racing lines, drift control and pursuit evasion reward clean hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dirt Showdown
Demolition modes reward predicting human movement a little
Need for Speed: World
Human rivals in lobbies add slight positional 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
Need for Speed: World
Pursuit spawns and lobby skill add mild noise
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dirt Showdown
Event types and boost routes are quickly learnable
Need for Speed: World
Car builds, powerups and route knowledge compound advantage
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.