I think you should use whatever you can develop the fastest in, this might be Rails if you are a beginner, or node, sinatra, or some python framework if you are

I think you should use whatever you can develop the fastest in, this might be Rails if you are a beginner, or node, sinatra, or some python framework if you are a more experienced programmer. The author fail to mention that node also scales way better and you probably will have no problems serving at least 10k users will where as in Rail you would have to play with scaling way earlier.