Recommend you get a consensus in your group to the resort or resorts you want to stay at as early as possible, which usually will provide you the best selection of room and
discounts like AAA rooms. I would also recommend if you have not traveled with this group that you discuss every ones expectations so you develop a common understanding regarding parks, resort, dining, etc. . After that I would recommend you continue to look for better deals that may be introduced during the time periods prior to your trip. If this is not your thing, consider a Certified Disney Planner-
Travel Agent to help you. Special discount offering usually will need to be booked during specific time periods with limited number of rooms. Then you also have possible "free" dining offerings. Overall, its about location/resort, price and your budget. I would also grab the park hours this year to get an idea how they differ, along with parades, shows and special seating offerings. This will help you manage the group in making ADRs, Special event reservations, dining special events. Overall, Wilderness Lodge and the Poly have trending in being some the more popular resorts to book out early.