You can't go wrong with any of them. I think Django has a slight edge by having a slower release cycle. I find it a desirable quality in a development framework. While the number of man-months spent developing Rails is an order of magnitude greater than that spent developing Django, is it really that much better for the bottom line? Most of the early efforts spent on Rails were to make the infrastructure and communit…
Wildly off base figure
1. Years under development. ROR: 5/Django 5
2. Members in largest google group: ROR 18000+/Django 14000+
3. Members in Irc currently: Ror 436/Django 401
4. Commits to repo: Ror ?/Django 11000+
So while Ror has a bigger community, it is not that much bigger.