Regarding jobs for each framework, there are far more Rails jobs than Django jobs: http://news.ycombinator.com/x?fnid=JBPFd8i2nk.
For me, I periodically use Django for content-centric sites with standard CRUD operations primarily performed by a small number of privileged users, but I prefer Rails and Sinatra for most projects. I prefer the Ruby web development ecosystem, with libraries like Haml, Sass and Compass.