We have stayed at both. ASMu was our first trip. When we travel with DH we need to have two rooms. It just isn't fun for him if he doesn't have his own space, so we work out two room. We loved it. The room was perfect for our needs. Loved having two bathrooms. The girls didn't have to share a bed, which they hate, but will do. (We stayed in a 1BR villa and they hated having to share the pull-out sofa).
I took the girls on a solo trip and we stayed at CBR. The girls were older and we LOVED the pool (the main reasoning for choosing CBR). The splash area for the little ones was fantastic. As were the slides in the big pool. We were Aruba and had a walk to the pool, but it was fine. Although, it always seemed to rain when we headed over there. We never had any issues with busses (well one time coming back from Downtown Disney). I ended up sharing a bed with my little one and my oldest had a bed to herself.
I am not sure that I could be in one room for 9 nights (I know DH wouldn't survive), so I would do whatever I could to get more space. We are going in October and staying at AofA in a Lion King suite.