We are a family of 4 (soon to be five). We stayed at AOA and Bay Lake Tower last year. While the theming of AOA is great and it has a lot more room to spread out and two bathrooms , I have to go with the Contemporary. Being able to walk to and from the MK with little ones is fantastic. At the time our kids were two and five so we spent most of our time at the MK. We booked at lakeview room, which also had a view of the MK. We could see the fireworks at night. Of course, all the rooms aren't like that so it is luck of the draw. Also the Contemporary has Chef Mickey's and the monorail, which my kids loved. My kids did prefer the pool at AoA (you can't win them all). Honestly, you can't go wrong with either, but I think the Contemporary is way more convenient. Have you considered renting points at Bay Lake? It might save you a little bit of money or allow you to get a room set up similar to AoA at the Contemporary (best of both worlds).