Comparing them end-to-end, Rails comes the most productive in my opinion. But there are bolder parameters you may consider. i.e. no one switches from Django to Rails to improve productivity and vice versa (probably from Laravel to one of those two).
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The language's productivity also matters, which both Ruby and Python are better for that.
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There is a philosophical difference between #Django and #Rails :
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Django supports the "Explicit over Implicit" idea, making it easier for newcomers to understand what's going on. This idea also has downsides. This allows beginners to start working with Django without even learning Django and best practices and defer learning by using references like Stackoverflow.com, which is not a good idea because you potentially don't know things that you don't know! Also, you may find many different project styles.
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On the other hand, Rails support the "Convention over configuration" and Scaffolding idea. It's easier for a Rails developer to be added to a new project or just review a random Rails project. Everything has a default and also it has some downsides as well. e.g. As a beginner, everything feels like magic in Rails, and you don't understand what is going on and how Rails understand while you didn't "explicitly" say what do you want sometimes.
Conclusion: Rails and Django are more productive and you can build projects on your own quickly (many giant startups launched this way!). #Node.JS isn't immature, also sometimes shows better performance comparing the mentioned alternatives. But if you suffer from "a million different ways to do everything" and "many decisions to make", Take Ruby on Rails for sure.
P.S: for learning RoR I suggest the book/video from Michael Hartl.
