XmlHolder VS Grutil.getXmlHolder : when we can create xmlholder instace with its consturctor  XmlHolder(String xml) ie. using code
      def holder= new XmlHolder(context.expand('${Login#request}')
  
why do we use GroovyUtils  class to create xmlholder object as mentioned below..is it code performance

def groovyUtils = new com.eviware.soapui.support.GroovyUtils( context )
def holder = groovyUtils.getXmlHolder("GetUserTypes#ResponseAsXml")