i don't care which one, as long as who ever we have does what they do very well and it translates in to W's.
this is a "grass is greener" question. Personally, i like to have a qb that can move. not necessarily "dual threat", but can move well in the pocket....John Elway comes to mind, and, for unkown reasons, Big Ben has some qualities similar to that.
I don't think you need one or another, but he must be able to throw from the pocket first, and second, be able to move around when things break down, or pressure builds.