AKV Kidani and BLT have the only 1BRs at WDW with two bathrooms and both of those are large 1BRs (smaller than OKW and VGF but larger than any of the other DVC resorts). BLT gives you an MK monorail resort from which you can walk to MK, and if you get high floor lake view, some very impressive views. If largest size is most important, OKW is the one. If most elaborate decor and furnishings is key, then it looks like the new VGF will be the one. That of course also gives you easy access to MK and Disney's premier monorail resort address. If easy access to two parks, walking ability to dozens of restaurants, and a resort with its own night life is important then BWV is the choice, or nearby BCV.
Note if you are going to be booking at 7 months out for Dec 15-19, you should not expect to be able to get low point options at a near park resort, BLT standard or BWV standard view, or get BWV boardwalk view, but BLT lake view, BWV pool/garden, VWL and even BCV have a good probability of being open third week of Dec (December's only moderate DVC demand week; the other weeks in Dec are DVC's highest demand times of the year).