The Universal Snapshot is a shorter assessment, good for Groupshots or if you're wanting a quicker way to assess a child / young person. The Comprehensive uses all the questions from the Universal Snapshot (approx. 40) plus about 30 more, and helps to focus in more detail on where the child / young person is in terms of their emotional development.
If you're working 1:1 with a child we would recommend using the Comprehensive Snapshot to give you a more detailed view.