HI Shivam, If you the only person who is going to develop the full application then I will suggest you to go for Node.js because you will have to deal with one language only i.e. Javascript. And if you are thinking about scaling then do not worry. Nodejs with mongodb make good application. Capital One bank, Paypal, Linkedin and so on companies shifted themselves to Nodejs. Even if you go for Ruby, it has GVL which again makes it work in single thead. If you want to manage concurrent requests in Ruby then you have to manage by introducing Rubinius/jRuby. If we talk about the deployment of Nodejs, it require less resources as compare to other. I have deployed inventory solution right now using Reactjs with Node.js stack and it is pretty much good. I have also deployed apps in Ruby as well. However, node is fast as compare to Ruby and you can scale it easily. I am not saying Ruby is bad. I work in Ruby as I told you above. But these are the real facts.

You can checkout this link :- https://softwarebrothers.co/blog/companies-that-use-node-js/