Ruby on Rails vs. Node.js

The question is which should new web developers take up learning, and why? Now, hold your horses - I know that comparing Ruby on Rails and NodeJS isn't completely a 1:1 comparison. Rails is a full web framework and NodeJS with ExpressJS is more comparable to the likes of Sinatra - that's not the point. The point is going forward which is the more progressive and powerful tool to use to develop user-friendly web applications?

Let's discuss...