If you're looking for a powerful Twitter client for your mobile device, then consider Plume for Android. It may not be quite the looker that Carbon is, but it has powers that many Twitter users consider must-haves.
Visually, Plume isn't particularly impressive. While Carbon (in my opinion, the most attractive client on Android) looks clean and is easy to read, Plume looks noticeably cramped. The tweets are all pushed close together and the mish-mash of colored text for links, usernames, and Twitter handles doesn't help the problem. Make no mistake, though; Plume is not an eyesore by any means. It simply could use a little cleanup. The great thing is that Plume does offer the longest menu of customization options I've seen in a Twitter client. From the Settings menu, Plume lets you pick between different themes, change font size, customize colors, change the order in which tweets are displayed (chronological or reverse), hide avatars, and so much more.
What I do like about the interface is its slide-out menu on the left side of the screen. This nifty drawer houses Search, Favorites, Trends, and Lists buttons. It also offers shortcuts to your different connected accounts and to your own profile. If you go to your profile page, Plume even lets you edit your bio, location, and picture, which many clients don't.
The meat of the Plume app is organized into columns, similar to Tweetdeck and Hootsuite. You can even add, edit, and delete columns as you see fit, which is useful, considering Plume's support for multiple Twitter accounts and even Facebook accounts. So, within Plume, you could conceivably swipe left and right among columns for your various Twitter accounts' timelines and mentions, as well as your Facebook feed and a saved Twitter search. This sort of power and flexibility is perhaps Plume's biggest selling point.