I want to learn one of these by making a quick web application using AngularJS and I don't know what to use in the back-end. I do know that I want to use a RESTful API.
Both Django (the Python web development framework) and Express (The Node equivalent) are powerful tools useful for creating APIs.
When determining "Which should I use, X or Y?" I tend to ask myself a few questions:
Those are some great questions. Thank you very much.