I’ve tried two clients on the iPhone, Wikiamo and Quickipedia. They both have their merits but since there is no need to keep two Wikipedia clients on my iPhone I have to choose.
In my five minute review of both applications, I’ve settled on Quickipedia. I like the job Quickipedia does rendering the pages, especially with larger images. Wikiamo seems a bit faster but on my 3Gs it’s not really a factor.
Wikipedia has also just released their own official client. If anyone has any experience with this let me know.