Mach vs Sails.js

Mach has some pretty cool streaming functionalities built directly into it, if your web app provides any audio/video/data streaming features, you can consider using Mach to build it.

Since Mach already is asynchronous (stateless) which means your logic is implemented by using promises (then objects); hence your functions are pretty independent and composable.

No complex layers between plain HTTP requests and the corresponding JS functions invoked. Which in turn means each GET/POST/PUT or any other HTTP request is directly mapped to a Javascript function. Hence leading to a huge increase in performance for your app

One of the distinguishing features of Mach is it's robustness, errors won't be terminating your complete app, instead they'll bubble up so you can handle them gracefully.

Like most of the Node.js's core, Mach is an asynchronous web framework too. Each response (of a request) can simply be hooked up to a then method so that its result or the reason for failure can be retrieved after the action is complete. If you're wondering what async operations are, here's a pretty good explanation for you

Sails.js is built with a focus on building real time communication apps such as chat or multiplayer games, so naturally it has Socket.io extremely well supported.

This could be a huge plus, if you prefer to build your apps using the Model View Controller architecture. Using Sails.js you'll find the task of separating the business logic from the user interface and keeping the interactions between them in a separate layer, extremely easy.

Exposes public JSON API for free. No additional routing to be defined. Makes it pretty easy to access data from anywhere.

Sails.js uses Waterline ORM at its backend which means you can store your data in any datastore that you like; all you have to do is make a change to the Waterline adapter, this will allow you to store your data in MySQL/Redis or any other kind of database.

Clear documentation and easy to understand. The file structure gives you a way to understand where you can start to develop when you encounter a new Sails project