I think if the mesh is going to be subdivided it is very important that the topology should be good to begin with. Subdivision isn't going to add detail. And then "good topology" is probably also related to the purpose.

Most people want to add some muscularity to a figure with morphs, so it is good if the mesh already aligns with where the muscles are supposed to go.

Alyson  2 and Ryan 2 have good topology as far as I am concerned - on the body at least. Or just by-pass them and go with Anastasia and Tyler. However, they are high-poly already and won't benefit much by subdivision.

James P6 comes in a High Resolution and Low Resolution version. The Low-res version has very good topology I believe. Response to SubD is not perfect but it is good. Extra faces are created but they don't show in the render. The same goes for the low res version of Jessi P6 - she doesn't seem get any artifacts from SubD and the muscle definition is there. Note that there are morphs available for them besides the ones that come with Poser.

Alyson 1 Low Res and Ryan 1 Low Res have good body topology but the faces don't appeal to me.

 

 

 

Poser 11 Pro, Windows 10

Auxiliary Apps: Blender 2.79, Vue Complete 2016, Genetica 4 Pro, Gliftex 11 Pro, CorelDraw Suite X6, Comic Life 2, Project Dogwaffle Howler 8, Stitch Witch