I actually use both clients regularly. If I want to just see a quick update on latest tweets I open up twikini, since it loads so quickly. You can pretty well do most of what you need using it.

For times that I figure I will be doing more, its Pocketwit every time. It has all the features packed in.

Yep, speed is Pocketwit’s Achilles. While I appreciate the work put into Twikini, if Pocketwit was quicker, there would be no need for Twikini.