they're all nice....
and all will put you in the disney mood...
let's see....which hotels are deluxe? Grand Floridian, the Yacht Club/Beach Club, Boardwalk, Wilderness Lodge, Animal Kingdom Lodge, Polynesian...any others?...probably the Contemperary is still considered deluxe...
so...of those i'd stay in either the Grand Floridian (GF) or the Yacht Club (YC).....
as to why?....the YC (together with the BC) have the best pool on property (stormalong bay)....so if that's important to you then by all means go for the YC/BC (we prefer the YC's decor, but they're basically the same hotels other than the decor)...it's also within walking distance of EPCOT and boating distance to MGM, which is very nice and convenient...
as for the GF...this is our favorite....specifically the GF sugarloaf lodge concierge.....why?....i can't really explain why it is, it's just the one that's most magical to us....and of course, it's on the monorail line to the magic kingdom which is very convenient...
but this is a very subjective opinion....everyone is going to have their own favorites.....
but having said the above, i have to add that we've stayed in almost every hotel on disney property (all except the caribean beach) and each and every one is magical in its own way (including the budget rate All Star resorts).....