[rahimnathwani]

Picking a framework to get started isn't a lifelong commitment. So trying to optimise for these 5 factors (the 4 you listed, plus being able to get a job) at the same time is overkill, and unlikely to result in a better decision.

Just pick one. You will not regret starting with Rails or Django, providing you put in sustained effort to learn best practices.

Re: 'fast prototyping', the RoR+React combo won't give you that. De-coupling the front-end and back-end of your code has many advantages, but fast prototyping is not one of them. Particularly as you'll be learning as you go, with two different languages (Ruby and JS) and two frameworks, you'll spend twice as much time stuck.