PHP count or self::STAT


which is the best among these two method

1- i used the PHP count method to display counts of an object iteration

eg <?php echo count($model); ?>

2- using Yii AR self::STAT to get the value of counts

$criteria = new CDbCriteria;

$criteria->condition = "foo=1";

// why do not use CActiveRecord count property?

$count = SomeModel::model()->count($criteria);