You're probably going to get a lot of responses with "this is why rails is bad" and "this is why django is good".

Though having worked extensively on both and not having a particular love for either, the simple answer is this (IMO):

Python skills transfer to other industry disciplines far better. Picking Django (vs Rails) is just a good career move. Data scientists use Python heavily (scipy, numpy). Many universities teach Python as the first scripting language. Python has a much stronger foothold outside of web frameworks.