title: ORM ordering vs Model "Meta" ordering - Django 1.11
body: <p>Small question - what is better way for ordering items:<br>
  1) </p>
  
  <pre><code>class Table(models.Model):
      ...
      class Meta:
          ordering = ['user']
  </code></pre>
  
  <p>2) <code>Table.objects.all().order_by("user")</code><br><br>
  I think second is better cuz first always will return ordered querysets, and if sometimes we don't need order - it will take additional time? Are there any other reasons to use 1 approach, exсept convenience of "not-writing" <code>.order_by("user")</code> every time?</p>