VWL for the Thanksgiving-New Years books early because of the decorations and closeness to MK.
I agree with the pick out the resort you would be most happy staying at not what others book theme. I think BLT is interesting and may want to stay there some day but would much rather be in my OKW 1 BR with the big balcony and quiet peaceful feeling after a day in the parks. We also love OKW because the 1 and 2 BR villas have more room for the children to move around and play when we are in the villa. You may like the feel of AKV more or want to have access to SAB as a priority so should consider those properties. We thought we wanted the SAB access and bought points there. The villas themselves just aren't that special unless you get one of the huge balconies but the closeness to EPCOT is a good reason to stay there. Since we have owned those points, bought presale, we have only stayed there 3 times - number 4 is coming up in Dec. I did book it at exactly 11months since it is the first week in Dec and all
DVC units get booked early for that week. Also don't forget the young child today will be a teenager some day so don't buy based on what is most likely to appeal to the child - buy what appeals to you.
Good luck with your decision and let us know what it is.