Location, location, location!
Deluxes are generally closer to the parks. monorail loop are deluxes, with wl being a boat ride (and a *less expensive* deluxe). ak is also a *less expensive* deluxe and not walking to anywhere. bw and y&bc are walking & boat to epcot and mgm.
we love the deluxes for the room service availability, atmosphere, especially location (you can't beat seeing cindy's castle from your resort, watching and hearing the fireworks, the electric water parade...)
but i'd take disney any way i could! value, moderate, deluxe, or staying in the cheapest motel in kissimmee (which is what we had to do growing up, and we loved it!)