It depends on what you want to build. I find nothing novel in either tool, so I don't think it's good to learn in a mind-expanding sense. For building medium-si

It depends on what you want to build. I find nothing novel in either tool, so I don't think it's good to learn in a mind-expanding sense. For building medium-sized external-facing apps, rails is one of the better choices out there. For building long-running client-side applications, angular isn't a bad choice (though I prefer Ember for that constraint, personally.) If you live in the land of Oracle or other proprietary databases, I wouldn't suggest rails. It has some rough edges in my experience. Otherwise, I think you should find a project and run with it, or join a place already in the rails ecosystem. I wouldn't learn it for its own sake.