Twitter twittering, pt. 2

One thing I have noticed about using the Twitter apps on the iPhone is that they are somewhat interchangeable in function. Rather obvious observation, but what distinguishes one app from another? There are a few basic things I like to do when I'm using Twitter each time I open an app: check updates, direct messages, and respond to any follow requests. All four of the apps I have do these things in a very similar way. The differences are small, but may make the difference in choosing one app over another. For example, TwitBird Pro (formerly iTwitter) shows the most recent update so that you have to scroll down to find the last unread tweet. I have tried to find a way in the settings to switch this option, but I haven't yet. If I don't check for awhile, when I update I have to scroll down to find the last unread tweet. TwitBird Pro does allow for easy marking of read tweets, although the only option is to mark all read. I have been using TweetDeck more and more lately because of the groups option, whihc allows you to create groups for easier following of your Twitter friends. I also like the interface with TweetDeck more than the other three apps I have. The experiment will continue as I try to determine why I like one app more than another.