Which way is better in duplicating html elements through jquery

Which way is better in duplicating html elements through jquery

References

Reference NO 1

http://stackoverflow.com/questions/921290/is-it-possible-to-clone-html-element-objects-in-javascript-jquery

Reference NO 2

http://stackoverflow.com/questions/416081/jquery-clone-duplicate-ids

Reference NO 3

http://www.w3schools.com/jquery/html_clone.asp

Reference NO 4

http://toomuchwhitespace.integritive.com/2011/02/18/javascript-better-practices-clone-html-templates-instead-of-directly-creating-elements/

Reference NO 5

http://tristandenyer.com/using-jquery-to-duplicate-a-section-of-a-form-maintaining-accessibility/

Reference NO 6

http://www.html.net/tutorials/javascript/lesson19.php

Reference NO 7

http://jqfundamentals.com/chapter/traversing-manipulating

Reference NO 8

http://api.jquery.com/jQuery.unique/