Which CodeIgniter ORM do you use and why?

[eluser]Carmichael[/eluser]
Here's a list of CodeIgniter ORM's:
http://codeigniter.com/wiki/ORM/

I've a hard time choosing a ORM for my new project. I've worked with php-activerecord but there's a few things I don't like with it and want to use a new ORM now for my new project.