DL + DCA have nearly the same number of attractions than the sum of the 4 WDW parks.
DL is more compact, meaning less time traveling from a place to another. You can exit BTMRR, shop in DTD and jump on the ToT in 15 minutes.
WDW has wonderful resorts and many time the shopping and eating opportunities.
Shows are better in DL.
Some attractions are better in DL, others are better in WDW.
DL has Carsland. WDW has the new Fantasyland.
It's a different experience, I love both. And I love
Disneyland Paris too. And sometime I'll go to Tokio DL too.
I know, Disney is my crack