Using the official twitter app for the iPhone is fine, but it’s not the prettiest thing in the App Store; so if your looking for the nicest looking twitter client out there, look no further than Tweetbot by Tapbots.
There aren’t any outstanding features that I haven’t seen in other Twitter apps, but that’s not a bad thing, I have yet to find a feature missing from the app. Tweetbots chose to be equals in comparison to other apps, but pushed the barrier when it comes to the look and feel of the app. The real reason someone would buy and use Tweetbot as their main Twitter app, is because of how beautiful Tapbots has made the app. This app is one of the best looking apps on the App Store, and you could definitely spend $1.99 on worse.