I had a lunch yesterday with Rod and he told me a great trick how to pick your development stack that I'd like to share with you. First, you choose a few obvious contenders. Second, find photos of core contributors to the tools you've selected and make a photo collage. Three, pick the tool who's core contributors resembles the most members of your team. Four, profit. Here's the photo collage that you can use if you cannot decide whether to go with Rails or Django.
Rod is colorful and to the point as always. We build our products in our own image and for our own needs. There's no escaping this.