When to use Smart Templates instead of Q&A?

Hi everyone,

I usually work in Clause9, but had a look at Smart Templates recently. I am trying to see if there is a use-case for my workflow. I am seeing many similarities between Smart Templates and a C9-Q&A

1) Can Smart Templates be turned into Clause9-Q&As? They share the same database-icon, but it seems that they are fundamentally different files.

2) When is using a Smart Template recommended over building a C9-Q&A?
Here, I get the sense that creating a Smart Template is initially a lot quicker, as you do not need to build the document first. I am wondering if C9-Q&A has more functionality than Smart Templates?