DTS has an inbuilt mobile browser detection functionality (integrated with WURFL) which allows switching to mobile templates when accessed through mobile devices.
DTS also comes with a frontend module that allows users to pick and save a template of their choice to be loaded when they visit the site. Personalisation with Joomla just leapt a mile forward!
Admins of a website can determine various conditions to switch the default template to another template. Want to show a different view to unregistered users? Want to have a more accessible front end (with dashboard modules, admin links) for admins? DTS allows you to set up any condition you can think of to activate a special template.