CakePHP, CodeIgniter and FuelPHP - which do you prefer and why?

I've been looking into learning a PHP framework lately and have spotted these three popular choices. They all seem to have similar approaches and methods, and I'm not sure where to begin. If you are or have been using either one I'd greatly appreciate any pros, cons or other info you might want to share about them.

I'm considering these frameworks with the following in mind:<br>
- Which one has best multi-lingual support?<br>
- Which is the easiest to implement / start out with?<br>
- Which is the most future-proof and versatile (i.e. working with NoSQL databases such as MongoDB)?

I have been using all of the mentioned frameworks, but I really enjoy using the codeigniter framework, because it is very lightweight and does not interfere with my workflow in doing too much things I don't want.
The i18n and multi-lingual support is really simple, there is a helper and a class ready to use.
Codeigniter has also pretty much support for any database you may want to use. If you happen to use a database that isn't supported, you can easily write your own database driver, just take a look at one of the driver files.
It is also very easy to integrate other external libraries e.g. Doctrine, adodb into your project.