+2  A: 

Zend Framework is a glue framework, meaning you do not have to use it with it's MVC component. You can use it like a full stack, but you don't have to. That makes it somewhat better suited for general purpose, because you can use many of it's components in isolation or in conjunction with other frameworks, including Symfony.

Gordon
A: 

I prefer Symfony, http://www.karlkatzke.com/php-symfony-vs-zend/

Osman Üngür
Citing: *"This article was published on 27 November 2007. It references a release candidate version of Zend Framework"* - that's not a a useful comparison anymore.
Gordon