Hi Tamar W~You would have to check out the curriculum for each studio (which is listed in the Tisch portion of the NYU website) to compare the amount of voice and dance/movement classes incorporated into their training. Others with experience might be able to answer your question in more detail. In regards to CAP21-it stands for Collaborative Arts Project, 21st century:
http://drama.tisch.nyu.edu/object/DR_CAP21.html