My recommendation is to get rid of the one YOU don't like rather than seeing what everyone else uses
I personally like that I can have Tweetdeck on pretty much any platform, the unified way of viewing tweets and Facebook updates on my desktop, laptop, and phone has a lot of benefit to me. Plus the price is right...
I like the aesthetics of tweetcaster much better than tweetdeck (but prefer twidroyd over both - not necessarily for aesthetics, but because the latest version of twidroyd allows you to view links right in the app without having to open the browser...which is killer!).
Well I think several questions need to be asked to decide "Tweetcaster or Tweetdeck"?
1. Do you use Facebook?
2. Do you wanna be able to see Facebook statuses also and not just post status.
3. If you don't use Facebook which UI do you like better?
If you use separate app for Facebook it's your phone. Don't ask input. It's your phone use the one you want.
Personally, I use Tweetdeck because I use both Twitter and Facebook and I wanna see status updates from Facebook and tweets from Twitter as well as wanna be able to post to both. Tweetdeck also has Google Buzz and Foursquare if you use those protocols so you won't need all these multiple apps.
If I wasn't using Facebook, then Tweetcaster would be my choice. It's got trends and nearby which Tweetdeck doesn't, and I like Tweetcaster's interface better. I'm actually using both right now until Facebook gets push notifications.
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