I am currently in the process of building a mobile app, on iphone. I want the app to be able to connect to a web back-end server to manage user logins and to and retrieve user data. Which would be quicker/simpler to build that type of back-end RoR or Django?
Go with whichever you are most familiar with.
I can't answer about Django, but if you want to write it in Ruby, you should consider using Sinatra as a lightweight alternative to Rails.
If you choose django and are planning on handling RESTful requests from the phone, you should look into django-piston.
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