What do you think Symfony is better than Yii Framework and also brief your answer?

Sure symfony is better than Yii framework 

I do not think Symfony is better :DBasically, Symfony2 will give you better ORM if you use Doctrine2, better decoupling of entities, Composer support for extensions update and better Testing scenarios, although you will sacrifice some performance by leaving Yii.The good thing is, Yii2 will solve most of these problems anyway.