I notice the OP hasn't replied yet.
So many things are already covered, but I think what's important is what the guests wants from a vacation.
WDW offers ...
- More diverse resort selection and a more resort-like feel
- A much wider variety of sit-down dining options, largely because of EPCOT, Disney Springs, and resort dining
- Better park diversity, DL doesn't really offer anything along the lines of World Showcase or Animal Kingdom. I know these have a big appeal to those are aren't large thrill seekers
- A better selection of shows, though many seem an afterthought to fill out the attraction list
- Golf, boating, fishing
- Water parks
- Larger shopping and dining in general
DLR offers...
- Rides. The 2 DL parks offers more rides than all four WDW parks combined. DL itself has more rides than any two WDW parks
- Walk-able. DL and DCA combined are the roughly same size as EPCOT. All shopping and dining and hotels are in a walk-able footprint
- History. It is the park that Walt built, ran, and strolled around. It's history and attractions are well documented for those who want to research. The park may not look the same as it does in old documentaries and TV specials, but so much is still there to see just as Walt introduced it
- A better quality of shows
- Seasonal layovers. DL caters to the guest to goes ~3 times year, so they like to change it up some
Personally, we are ride people and love DL. 15 hours a day all rides, no pool time, no shows. fWe also enjoy the more "laid back" planning many people here already praised (since we ride most rides multiple times, planning a few FP+ six weeks in advance seems anal-retentive). When at WDW, we made heavy use of the water parks, golf courses, and EPCOT and AK, but go to MK less and less because it just doesn't live up to DL.