As a PP stated, there are a bunch of threads on this.
We love the GCH the most (though we've only stayed at the VGC) because of the proximity. Location, location, location. Love walking down from my room in rubber slippers, onto GRR, riding 2-3x, then walking back up to my room, throwing my wet clothes in the dryer, having a snack then heading out for more rides in more durable walking attire. This is the reason that we spent so much on our DVC and don't regret a penny.
We did get to stay at the DLH a few times last year, and it is lovely. Rooms are brighter, more fun, and the pools are spectacular now. If they build a DVC here, (which Iger said they won't recently) I'd buy enough points for a few weekends. Though I enjoy walking through DTD more than walking on Harbor, its still quite a bit of walking and the monorail always seems to go down on our trips

(we don't mind the extra time and love being dropped off in Tomorrowland, just wish it were operating more consistently in low seasons).
If I have a long trip, mostly adults with lots of nap time, GC. It is elegant, romantic, and close. A kid trip or a shorter trip where we're going to be more park-intensive and leave the room in the morning and not take breaks as often, or want to spend more time in the pool, then DLH.
VGC FTW!