I think you should go with Acrobat. It offers everything you mentioned and the forms you can create using AEM (or LiveCycle Designer, as it's also called) are much more complex and not so well supported.
You can purchase a monthly/yearly subscription for Acrobat or a perpetual license. The former has the advantage that you get updates much more regularly and don't run the chance of having an outdated version. It also includes features that the "classic" version doesn't get, or gets much later.
You should buy it directly from Adobe, either way.