Another vote here for Yacht Club!
I love Poly and Beach Club, but they are very "family friendly" and their lobbies are always swarmed with families checking into 'Ohana and Cape May Cafe. YC typically has conventions going on and it is very quiet throughout the day. Prime location to walk to Epcot and DHS. Yachtsman is also wonderful and is in your lobby! You would also have a nice quiet pool away from Stormalong Bay. BWI has some big fans, but the rooms are very dated compared to YC and BC. It's going to start a refurbishment soon and IDK if that will fall during OP's stay.
GF would be my 2nd vote after YC if OP doesn't want access to Epcot and DHS and prefers access to MK. The lobby is so big that it handles large crowds much better than Poly. It also has some of the best adult dining on property. It's going to be under a lengthy refurbishment and I am not sure if this will negatively affect OP's stay (paths rerouted, Narcoossee's closed, lobby changes, etc).
Without kids I feel like the Moana theming at Poly and Incredibles theming at CR can get lost on travelers. Poly is also going to be a mess with the
DVC tower construction. I personally wouldn't want to stay on the cash side until the tower was completed. More than half the non-club level rooms will be on top of the construction site. Only Rarotonga, Niue, and Samoa are on the other side. Utilities are already mapped out and Luau Cove is currently being demolished.