I've only stayed at CSR and CBR, so I voted for CBR because it's my favorite one I've stayed at. However, I hope to stay at AKL, WL, and Poly some day...so I guess those are my "favorites" even though I haven't stayed there.
Well, CBR was the first Disney resort we stayed in and we liked it. I still prefer it among moderates, POR too far away and CS just not my style.
Have stayed in the Contemporary twice and loved it. Have stayed at the Grand Floridian once and loved it. Have stayed at various All-Stars and enjoyed them.