Node.js would be the best choice among all, you can compare all 3 of them on Stackshare and you will find that Node.js is on the top on almost every aspect, and since your focus is primarily on Performance and Scalability you won't regret after choosing Node.js. Also, the JavaScript open-source community has made a lot of effort and created numerous packages that will give you the speed and smooth execution of your project you need. Though your question was regarding backend, but if you choose JavaScript(Node.js) at your backend, then you can have a cross-functional team that can work on both, frontend as well as backend because JavaScript is everywhere, React Native for Android and iOS apps, React.js for single page web apps and Node.js ofcourse for your backend. And I don't have to tell you how much easier it would be to code and manage in a single language to build your complete system end-to-end. I hope it helps.

We recommend Laravel over Ruby on Rails (Ruby) and Express.js (JavaScript/Node.js). We chose Laravel ourselves for our own internal software project, recently after comparing these same 3 software frameworks. In selecting Laravel, we chose to build our app using the software language PHP. PHP has the largest market share of all the web-based software languages (close to 80% of all websites use PHP). Also, Laravel is the fastest-growing software framework based on PHP making it a wise choice.

We also plan to integrate WordPress and WooCommerce later with our Laravel web-app. WordPress and WooCommerce like Laravel are all built using PHP. WordPress is the most popular Content Management System in the world. This will allow us to build out the front-end marketing website in WordPress. Also, we plan to offer subscriptions and sell products. For this, we will use WooCommerce. WooCommerce is the most used e-commerce platform in the world. We’ll be able to use our same Laravel developers to extend our app to WordPress and WooCommerce. By standardizing on PHP, we’ll be able to use the same software developers on all 3 platforms. PHP’s large market share will be an asset to us as we start recruiting talented software developers.

Lastly, we are gaining access to a fast-growing and awesome community that supports Laravel. Before we made our decision, I personally met Laravel’s founder Taylor Otwell along with several of his team members. After meeting with the Laravel team at Laracon US in New York City and learning more about the direction they are going with the framework, we’re confident we made the right decision.

To read the longer version of this answer where we go into more detail behind our recommendation, visit https://rackless.com/laravel-rails-expressjs