You can't go wrong with any of them.
CBR is our favorite. The rooms are just a bit larger, have a dressing curtain, and have just been redecorated. The beach theme is great for hot weather. There are beaches in front of each "island village" as well as on the Island near the main pool. There are also pleanty of quiet pools so that you never feel crowded. There is also bike and boat rental.
POFQ is great because of the size as well as its recreation of New Orleans. The pool is great. I also really enjoy the boat trip.
PORS is beautiful and has two different themes going on - the Southern Mansion, and the swampy, bayou feel in Alligator Bayou. Boatrights is a great restaurant. Like CBR, there are pleanty of pools to go around and lots of fun things to do (bikes, boats, fishing).
CSR is a beautiful resort. The main pool is wonderfully themed. The full service restaurant offers wonderful food, and .... there is a spa. CSR also offers thre distinct building types, the Ranchos, Cabana, and Casitas.
Again, any resort you pick will be great.