You didn't say if you have any children or if you mind vacationing where plenty of children will be.
AS, BW or DT. Ugh. If everyone traveling with you are adults and you intend to spend a significant amount of time at DTD (and not in the parks) then staying across the street will be a good option for you. I would consider renting points from a DVC owner at OKW as it would be a very nice bonus for you being on property and close to DTD.
As for the AS, I don't know when your planning on visiting, but I would think on this issue. Personally, the hotel is okay and the property is very properly themed for children and tweens. The rooms are small and would require bussing to DTD. Not to mention depending on the time of year, you may want to check to make sure no large children's groups are staying there (ie. Pop Warner group in Dec. and cheerleaders in Feb.). When I last stayed here, we were up at night (after returning from DTD) and hearing noise from the kids at all hours. We were 3 adults and only stayed there due to last minute trip, cheapest hotel on property and not wanting to rent a vehicle during our stay. It certainly may be worth a thought about staying at the Pop Century when it opens.
Have fun planning.