Many people prefer the Sierra since it is the closest to DTD and the Neverland Pool. I think they all three have advantages. The Bonita is nice because you are close to the fountains and Koi fish ponds. The Marina is nice because it is the main building where the gift shop and lobby are located. I prefer the Bonita, we once had a room facing the fountains/Marina Tower and had a wonderful view of the Matterhorn and Big Thunder Mountain. Many people will say the walk from the Bonita to wherever is a pain but it is maybe a one to two minute further walk at most. They are all nice and the rooms in all three towers are larger than your average sized hotel room, have some nice Disney touches in the decorating and pretty furnishings. Regardless of which one you get be sure to explore the grounds a bit, they are really pretty! You can request whatever you think you will like but just know that requests are subject to availability. Unless you pay for a premium view either looking at the pool or DTD. Also, if you do make a request I would call the hotel directly a couple of days beforehand to make sure they have noted the request. If you don't pay for the premium view, you may end up with a parking lot view but the room will still be nice. Of our five stays we have only ended up with the parking lot view once but I think we could see a slice of DCA and also we were in the room so little we didn't care. Also, if you don't get a daybed room, they do have free rollaways. My daughter thinks the rollaways are more comfortable to sleep on but having that couch that makes into the daybed is a nice feature. Good luck, the DLH is my favorite hotel anywhere, we love it!