Devonthink pro would be the best if it had one feature — the ability to add small notes to everything with links to other documents. For example I have a text document with some info, I’m adding a note saying that you can read more at page 20 of A.pdf and there’s a link from note to pdf page. And not only pdfs but to other documents as well. Links from pdfs to other pdfs/docs would be good too but not as important as links from docs to pdf pages.
Thank you.