I haven't kept up with Rails or Java for a couple of years, but Rails has always been laser focused on rapid feature delivery. If I knew up front I'd end up wit

I haven't kept up with Rails or Java for a couple of years, but Rails has always been laser focused on rapid feature delivery. If I knew up front I'd end up with twitter I might not start with Rails, but I wouldn't choose Java either. The truth is, there are a lot of good options today and hiring will be a consideration. I think the big negative for Java there is that almost every dev sort of knows it, so the signal to noise ratio there isn't very good.