I like all 3 DL resorts and have stayed at each 4-6X. PP is nice because price is less, and the upper floor park view rooms are GREAT. I love looking at Carsland all night long. It is slightly less awesome since the stopped allowing PP guests to cross the street to enter DD or DCA thru the GC lobby. Pool not great, but adequate.
DL Hotel is so lovely and interesting. Love those headboards and the monorail pool! (However the old Peter Pan pool was in some ways more interesting). The lobbies of each building are something to explore. Great displays, models of the rides from Imagineering, for example. Trader Sams! Nice to have a short walk after spending a fun night there. Goofy's Kitchen too. You need to walk the entire length of DD to and from the parks, or use the monorail to/from DL Tomorrowland at times to save steps.
GC is of course the best location. I cannot wait to see the new construction finished out by the pool and the QS location reopened. I usually stay there via a DVC reservation, but have also stayed in the main resort hotel a few times. There is no downside to GC except the prices!
I like all 3 very much.