What's your favorite iOS twitter app ?

With the dozens and dozens of twitter apps out there in the app store, which have you bought, loved, hated and end up going back to?

I have tried them all and always end up going back to either the official twitter app or tweetbot.  

I think tweetbot at the moment has by far the best options, beautiful design and interface for almost any type of basic or power twitter user. 

So what do you use?