In one of my classes, we were asked to research the top professional journals in our field.
According to what I can dig up, the ACM and IEEE journals are the "best", as they come up at the top of my searches and this question.
However, there are a dozen or so individually topic-ed journals for each, with no very clear measure of which one is most useful, popular, etc. For example, "IEEE Software" vs. "IEEE Transactions on Software Engineering".
So, what do you consider to be the "leading" professional journals (specifically), and why?
It doesn't have to be only ACM or IEEE, either. If you know of another, please add it.