If there are children, a dedicated is usually preferred so that they don't have an entrance to the hallway from the second bedroom. Plus, depending on the resort, most 2 bedroom dedicateds have 2 queens in the second bedroom vs a queen and a sofabed in a lockoff (except OKW).
We stayed at SSR in a dedicated 2br/2bath it had one entrance. There was a little foyer area which was nice, just to put the stroller (folded) there. The dedicated also had 2 queen beds in the second bedroom which was really nice.