Quidam and Poser don't share the same mission so a direct comparison is meaningless. As stated, Poser has a thriving community of artists and content producers. Poser has animation capabilities and can create custom faces from photos using the face room, but I have no experience in this area.

Quidam is a character generation program with no animation and limited rendering capabilities. That is - it is meant to have characters end up in another "destination" program such as Max / Maya / C4D, etc. The Pro version supports user definable poly counts for use with a subdivision-capable render. Modeling faces from photos is like sculpting putty and airbrushing a texture - meaning that it can be time consuming depending on your skill level. 

For photo -> mesh, I use Facegen and weld it to a body in my modeler.