Superclean has been using Drupal since 2005. Drupal is an open-source CMS (content management system) that grew out of the Howard Dean campaign in the early 2000's. Many high profile website are made with Drupal, including WhiteHouse.gov, Rolling Stone, Stanford University, Mattel, Nike, and many many more.
[ 2017 update: 10 Most Famous Websites Developed Using Drupal ]
So why is Drupal our favorite? First of all, it is open source so that you are not locked in to a proprietary system. If things don't work out with Superclean, there are many thousands of Drupal developers/designers all over the globe who can help you out. Also, there are no licensing fees.
Because of its popularity and always-growing developer base, Drupal just keeps getting even better!
But you may be asking... how does it compare to other open source CMS?
The most widely used CMS is probably Wordpress. Wordpress is simple to use, well optimized for SEO, and it is pretty easy to get rolling with their integrated hosting service. Wordpress is primarily a blogging platform. A lot of our customers start out with Wordpress but eventually "hit the wall" when they are trying to create custom content to render in special ways. Drupal might be overkill for a mere blog, but it can do so much more.
Joomla is another widely-used CMS platform that competes with Drupal. Like Wordpress, it is a bit easier to get started with if you are a do-it-yourselfer. But we found it limiting compared to Drupal, and we prefer the power of endless opportunities and growth for our customers. With Drupal, you never ask "can it do this?" Of course Drupal can do it! The question really is: "what's the best way to go about it for my needs?"