CMS battle between Drupal and EPiServer.
If online service is your core business, Drupal is a strong platform for accelerating your own type of development—even a very unique and magnificent one. It is no coincidence that media companies are big players in the Drupal camp. Drupal's model is also well applicable to extremely multi-channel publishing and performance.
If your online service is primarily sales and marketing oriented, EPiServer's product features should get you excited. Web teams producing multi-language marketing sites, in particular, should consider EPiServer as a power tool.