Is there any difference in following 2 jquery code snippet?

Is there any difference in following 2 jquery snippet? Both gives same output but does any one have any advantage over other or they are just one's choice to write like this to do the thing.

Snippet 1:

div = $("#myDiv");
div.append("<ul>");
$.each(cobj, function(k,v) {
    div.append("<li><span class='"+v+"'>"+k+"</span></li>");
});
div.append("</ul>");

Snippet 2:

$("<ul>").attr("id", "myUL").appendTo("#myDiv"); 
$.each(cobj, function(k, v) {  
    var li = $("<li>");  
    $("<span>").text(k).attr开发者_开发知识库("class",""+v}).appendTo(li);
    li.appendTo("#myUL");  
});  

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Both are not good ways to manupulate the DOM tree in terms of performance. I would suggest the following:

var ul = $("<ul id='myUL'>");
$.each(cobj, function(k,v) {
    ul.append("<li><span class='"+v+"'>"+k+"</span></li>");
});
$("#myDiv").append(ul);

In this way, browser does not re-render page after each li is appended, the entire list is build offline and then appended with single call.

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In 1 the UL has no ID, whereas in 2 it has ID="myUL"