If you're using either: How does your workflow look? Why is your system good for you?
The data for each invoice is kept in an org-mode radio table, and the invoice itself is generated from a org-mode source blocks. I "call" the invoice source block to generate the invoice, which is usually text but is occasionally LaTeX when the client really insists that they need a PDF. This result goes into a collapsible drawer, and I can easily save it out to a separate file. In fact, when the result is LaTeX it's possible for org-mode to process it into a pdf directly, although there are some quirks to be aware of there.
On the other hand, I don't use org-mode for keeping track of normal tasks much.
https://github.com/prophittcorey/vim-t https://github.com/prophittcorey/t.rb
So how does your workflow look? Do you use GTD or some other system? Have you ever looked at alternatives and compared them?
It is like a single person not really but kind of agile workflow. Works well enough.