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
Grapple and reversal timing with light mindgames against human opponents.
Dirt Showdown leans Execution (Practiced Mastery); WWF SmackDown! Just Bring It 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
WWF SmackDown! Just Bring It
Grapple timing and reversal windows decide matches
WWF SmackDown! Just Bring It leans a little harder on reads, though the gap is small.
Dirt Showdown
Demolition modes reward predicting human movement a little
WWF SmackDown! Just Bring It
Human opponents invite light reversal mindgames
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
WWF SmackDown! Just Bring It
Weapon spawns and AI interference add small chaos
Dirt Showdown leans a little harder on optimization, though the gap is small.
Dirt Showdown
Event types and boost routes are quickly learnable
WWF SmackDown! Just Bring It
Move-set knowledge and match-type tactics are quickly learned
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.