I have stayed in the Kidani and Jambo GVs. I have been inside the OKW and SSR GVs. All are nice but certain differences, other than just location, make me favor those at Jambo and Kidani. OKW's are the largest of that group and SSR the smallest, but all are still large. All four have four bathrooms.
Factors favoring OKW include that the GVs have the lowest point cost of all GVs (close to the same cost as standard view 2BR at VGF and theme park view 2BR at BLT)) and nice-sized balconies. They are often open at 7 months out for the time you mention except for the ones closest to the Hospitality House which often reserve at 8 a.m. exactly 11 months out. What I consider lacking in the OKW GV is no floor to ceiling windows in the high-ceiling living room; those windows exist at both Kidani and SSR. Also, most OKW GVs require using stairs to get to them because most of the buildings have no elevators.
The SSR GV has four downsides in my view: (a) only one fairly small balcony and that one is off the dining room area; (b) the living room is completely separated from the kitchen and dining area by walls making the living room and dining area feel small (the others combine those rooms into one large area); (c) the worst offense: the washer/dryer is upstairs; in other words, those most likely to be using it, the ones staying in the master bedroom downstairs, have to go upstairs to do laundry, and the most likely times you will be using it is when the small kids are in bed, in a bedroom near the noisy washer/dryer. OKW and Kidani have the w/d downstairs where it belongs; and (d) the points for them are too high because they should be closer to what OKW costs and the preferred view cost (needed for chance to get the favorable Congress Park lake view GV) is close to the same as AKV savanna view and even much higher during magic season.
The Jambo GV is large and has the open living room, dining room and kitchen. Having everything on one floor is a plus. Its balconies are huge and give great views of the savanna. The master bathroom is huge and borders on the hedonistic with a TV that can be watched from the tub. The addition of the room with a pool table is a plus for many (although personally I would rather just have more open space). Depending on location you can have a long or fairly short walk to the lobby, pool, and transportation. The one dislike: one side of the long dining room table has a park-like bench with no backing rather than chairs.
The 2-story Kidani GV has the one large room design for living, dining room, and kitchen. It also has the floor to ceiling windows in the living room that provide great views of the savanna, and though not very wide, the downstairs balcony is one long balcony running across all rooms on the first floor. A huge plus for us is the alcove at the top of the stairs with a pull-out queen, TV, and clothes drawers because it allows for those who may not want to sleep in the same bedroom with others to have an extra sleeping area other than just the pull-out in the living room. The dining room table is round and smaller than the other GVs but still OK. Also, those looking for a bargain in points can get one of the standard view GVs, often open even at 7 months out despite that there are only 2. Those have Pembe savanna view, and thus exclude giraffes, but you actually do see animals. A downside is that a number of the GVs are near the end of the hallways and that can mean a 1/3 mile walk or more down a long hallway to lobby and bus station.