Probably Hilton Lake Buena Vista has the better rooms, but really very close in quality to Hilton BVP. I really like the breakfast restaurant and the lazy river at HIlton BVP. I haven't stayed at Doubletree in years, but the rooms are suites. The shuttles are just ok, infrequent and most go to 2 parks so they can be slow. I usually either walk to Congress Park at Saratoga Springs or Disney Springs for a Disney bus, or just take uber/lyft, which is pretty cheap there. The value for money at the Hiltons is really must better than what you'll get at Disney owned hotels, especially if you are a member of Hilton Honors. Pre-COVID, it was great because these hotels do qualify for Extra Magic Hours and 60-day fastpass+ booking.