I don't understand the difference between the two. I'm writing Python and I would like tab completion. Why should I use one or the other?
I do not use Vim-Jedi but from what the doc says, the plugin allows completion using CtrlSpace.
Supertab is another plugin which remaps Tab to a sensible autocomplete behavior.
The author only suggests to use supertab if you want to use the Tab key to trigger Vim-Jedi completion (This is easier than remapping the key by
yourself in your
This means that you can use Vim-Jedi without supertab if you like its original completion with CtrlSpace. IMO you should just give Vim-Jedi a try without supertab and when you're comfortable with it, you'll see if you want to use supertab and make your choice.