Both are nice resorts here are the pros & cons:
AS - You will have two bathrooms, two tvs. Food court, beware of the youth groups they can be annoying and noisy.
FW- Sleep six, bunk beds, one bath, full kitchen, seperate lr, lots of activities at resort including the free chip & dale campfire and movie. Biking, petting zoo, Trails End Restaurant.
Some find the transportation at FW difficult. There is an internal bus then you switch to another bus for the parks. The MK boat is great and we really never have had to wait more than 15 mins for any of the trans.
My vote would be FW. You might want to go to the wdw website and order the free vacation planning video/dvd. It gives lots of good information about everything at wdw. Have fun whatever you decide to do.