which is faster

Here's a simplified example, but which option would be faster for setting variable $a?

HTML:
<div id="SomeDiv">
<a href...>text</a>
</div>

Option A:
var $div = $('#SomeDiv');
var $a = $div.find('a');

or

Option B:
var $div = $('#SomeDiv')
var $a = $('a', $div);