6. It’s less expensive
Again, this is basic. Straight across comparing same type of room and the same type of ticket for a family of 2 adults and 2 children on the same five days Walt Disney World is $1300 less expensive than Disneyland. That is a significant amount.
I’m not sure why the World is so much less expensive. We discovered this several years ago when we were gifted frequent flyer miles. We could spend a much longer time in Florida for less money. The savings let us buy a meal plan and still have a little left over for spending money. It was nice.
If you are coming from the west coast, you can lose those savings in airfare. However if you live equidistant from the parks or if you have frequent flyer miles the choice seems clear. You get more for your money at the World.