I recently bought autodesk maya, do I need DAZ Studio or Qui

[Banks]

Maya is industry standard 3d software. It was used to make Avatar. So in terms of capability you will not need any of the others, however quidam 3 seems to be designed to quickly make human models, so that I would keep. DAZ just does the same thing (and probably less) then Maya, so I would get rid of it. In any case, if you find yourself missing or not able to get some feature in Maya that is easy in DAZ, its free so easy to get back.
Hope this helps

edit-
Maya is fully featured, it takes modelling, texturing, rigging, UV unwrapping, animating, VFX all in its stride