By "resort" I meant the overall park experience, not a hotel on the park property.
First of all, WDW is very spread out. It's really, really huge. You cannot walk from one park to another, you will have to take a bus or drive. Secondly, there are 4 parks at WDW and only 2 at DL. There are many things to do at WDW that do not even require park entrance. For instance, you can rent boats, go horseback riding, fishing, etc.
As for the DL Magic Kingdom v/s the WDW Magic Kingdom ... the castle at WDW is much bigger, there is no Matterhorn and the many other attractions are different too. The Tiki Birds is different, Small World is different, Space Mountian is different, Pirates if different, Pooh and Pan is different, etc, etc. IMO, the nod almost always goes to the DL attraction over the WDW attraction. The MK in DL is small and intimate while the MK in WDW is spread out.
I think the biggest difference is the amount of time that you can spend at either resort and feel like you saw enough. You can easily do most of DL in 3 days but a week or more is best at WDW and you still won't even scratch the surface.
If you have any more specific questions, I'll be happy to help.