What does a Krayt Dragon sound like?

In the original Star Wars, a tribe of Sandpeople have clobbered Luke Skywalker and are stripping his landspeeder.  Ben Kenobi frightens them away by imitating the cry of a Krayt Dragon.

George Lucas changed the Krayt Dragon noise for the 2011 Blu-Ray version.

Listen for yourself.  Which is the better version?