The Telerik DropDownList control was built for compliance with major accessibility standards, such as W3C Web Content Accessibility Guidelines 1.0/2.0 and Section 508 of the Rehabilitation Act.
In simple scenarios where you don’t need the vast amount of features of RadComboBox, it will be better for you to use RadDropDownList because:
Use a single property to apply any of the 20 ready-to-use built-in themes, including an innovative mobile skin. Create a consistent look for your apps, while saving design and front-end development time. You can easily customize our existing skins or create your own with our Visual Style Builder.
When using the control in your apps, rest assured it behaves as expected and has a consistent look and feel in all browsers.Read the full list of supported browsers