I like the Dreams tower best. My kids like the pool view, and I can't decide which I prefer, pool or DTD view! It's the easiest location for accessing DTD and the parks.
My second choice is Magic, pool view. I would pay extra for pool vs parking lot view, assuming it's not a lot more money (it usually isn't much more). My kids love looking down at the pool, and at night they beam a lighted Tinkerbell on the bottom of the pool! This building is convenient to the lobby and restaurants, and is not far from DTD.
I personally don't care for the Wonder tower. The elevators are slow and the tower itself is farthest from everything except the waterfall and koi ponds. If you have to be in Wonder, try to get a room on the waterfall side. There is just nothing to recommend the parking lot side, IMO.
Finally, if you are going with a standard room, request Dreams tower (if that's your preference). There are still some standard rooms in it even though it's mostly pool/DTD view rooms. The standard rooms will just have a partially blocked view and/or be on a lower floor. Of course, you won't be guaranteed that tower, but might as well make note of it on your reservation.