I discovered that geometry switching and some older male figures aren't working properly in Daz Studio 4 Advanced.  Generally speaking Poser does give better support for legacy content, though some older texture maps don't seem to work as well with the new system.  It's really a mixed bag.  I like to use Michael 2, but since he's not currently working properly in Daz Studio I'll have to use Poser for that purpose.  I think it's helpful to have both programs actually, some things work better in one as opposed to another--but with the figures you mentioned there shouldn't be a problem in either.