title: $('#id tag') vs. $('#id').find('tag') - which is preferable?
body: <p>I want to know which option is better, particularly in terms of their speed:</p>
  
  <pre><code>$('#id tag')...
  </code></pre>
  
  <p>or </p>
  
  <pre><code>$('#id').find('tag')...
  </code></pre>
  
  <p>Also, would the same answer apply if you change <code>id</code> and/or <code>tag</code> to, say, a <code>class</code> or something like <code>input:checked</code>?</p>
  
  <p>For example, which is better: <code>$('#id input:checked')...</code> or <code>$('#id').find('input:checked');</code>?</p>