Haven't figured out how to drag pages between two different pdf documents. Haven't found ability to program repetitive actions, as I am able to do in Acrobat to reverse collate pages in a document that is scanned back to front. I also think the user community is considerably smaller, such that Google searches for ways to solve problems are less helpful than with Acrobat -- compounded by the Help system being opaque. However, Acrobat's Help system is just as bad.
Also, external systems sometimes work better with Acrobat, which is what they are used to.
It is sometimes hard to locate an expected function, but this is inevitable with a complicated program, and Finereader is pretty good at putting things where they seem to belong. Review collected by and hosted on G2.com.