If your application is a classic CRUD application than stick definitely with Ruby on Rails. Rails is super fast for creating and launching an MVP.
On the later stages the convention over configuration is really helpful when your app grows and you hire more developers. Development with Rails means that you should do Test-Driven Development which will save you a lot of headaches in the future. If you run into performance problems – hire some good DevOps guy to help you with the infrastructure 
If your application is a real time app, with two-way binding like messaging than you should look at Node.js frameworks like Express or Meteor.
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