JavaScript & CoffeScript - A comparison

What is JavaScript?

JavaScript is a scripting language for Web pages, but it's used in many non-browser environments too. JavaScript runs on the client side of the web, which makes the webside dynamic and smooth.

What is CoffeeScript?

CoffeeScript is a also a scripting language that compiles into JavaScript. The main aspect is to writing JavaScript code better by providing you with a more consistent and succinct syntax, as well as by avoiding the "bad parts" and the messy nature of the JavaScript language.

So which one to choose. Both have some pros and cons.