Disneyland is in California, Disney World in Florida, 2,500 miles apart. You pick one.
25,000 acres and 4 parks in Florida, versus 500 acres and 2 parks in California.
Disneyland fits a long weekend. Disney World's 4 parks need 4 to 7 days.
Walkable, less overwhelming, cheaper. Little kids do not miss the bigger resort.
Cheaper and shorter for a first trip. Scale up to Disney World later. See the full comparison.