Ruby on Rails framework was created for rapid web applications development and deployment. The most popular website built on Rails now is Twitter.com and the most popular e-commerce solution is Shopify. If you have an idea of a brand new powerful web product to win a fortune or need scalable and flexible business web application, Rails can be the best choice for you.
Development of a web application can be a matter of several days with Rails while with other technologies it can take weeks and months. When you need to build a big web project in relatively short time frames and want it to be really custom and/or complex, it worth thinking to choose Ruby on Rails among the rest possibilities like PHP, .NET, etc. This may result in considerable money and efforts savings due to the quite rapid development process.