Right now I'm sticking with Twitterrific. I played around with TB3 but the lack of a dark theme is a dealbreaker for me, among other things. Especially when Twitterrific looks really nice, and Tweetbot looks really bland.
I really love Twitterrific's notifications, too. The icons make them much easier to recognize, which in turn makes acting on the right notifications (specifically mentions / replies) easier.
Exactly. It used to be that Twitteriffic was the underdog but I think it's superior now. Too bad twitter views 3rd party clients negatively, hopefully they don't all get shut down in the future.