You'll get better responses if you post on the Resorts board or the DVC board. Old Key West rooms are larger and will give you more space, and are a quick boat ride to Disney Springs. BWV are in a more convenient location with the ability to walk to Epcot and DHS, plus many dining options at the Boardwalk and BC/YC. Just depends on what's most important to you - stuff to do, space, convenience to parks, etc.