Look at it like this: Deluxe= elaborately themed and close to one of the major parks, big rooms, lots of space. Moderate= well themed, close to a park but not right next to it, large rooms but smaller than Deluxe. These two usually have a table service restaurant as well as walk up counter service.
Value= not really themed, can be a distance from a park. But they save you money.
It should also be noted that regardless of where you stay, you have the same priviledges as anyone else staying at a higher tier hotel. EMH especially, and dining reservations.
Go with what fits your budget.
Our honeymoon was spent at POP in the 50's section. King sized bed, well landscaped, clean, not too noisy (even with the pool right outside our door). I have stayed in Dixie Landings and the Contemporary. I liked POP, but would do Dixie Landings any day. Not so much with the Contemporary.