That is a question I am really not qualified to answer. I say that for a couple reasons. First off, I have not rolled either through a Torii, although both would work. Secondly, I have only rolled the 7027A's through my ZMA, but others have had great success with the 7581A's in their ZMAs.
So, I really don't think you can go wrong with either. If the decision is too troubling, just flip a coin.