I suggest that Amapi (or Rhino) are not the best choices for producing items for use in Poser.  Amapi uses a method based on NURBS (in the main).  It makes for smooth and precise curves, mostly because it supplies as many points as needed to generate them.  This makes for an OBJ conversion product that has an untenable number of polys as far as being practical for use in Poser. It is my experience that in using a program to reduce polys automatically - the result is not a reduction where and how you would do it if modelled in a native Mesh Form modeller. 

Now that it produces quads, would not Marvelous Designer be the choice to produce clothing for Poser?

Because I come at this from a morphing point of view, I have been unclear about the difference between modelling and sculpting.  Looking at it for generating a new object, I can see the difference.  I think that if it is something that has or could have a blueprint a CAD type method would produce a more precise result - modelling(?).  For an organic subject without preconceived proportions -sculpting(?).