At the moment, for me, it's not worth upgrading.
The main timeline view hasn't changed other than allowing landscape view. Mentions and DM views haven't changed materially. Searches haven't changed. Profile view is nicer but I'm not sure if it's functionally different. Settings are streamlined.
The two big selling points for me, which are not quite enough to oust Twitterrific:
- Finally, and long overdue, granular mute filters that can be applied to searches and lists
- The excellent stats and activity view, far better than any equivalent in other clients
I was a diehard Tweetbot/Tweebot 3 user, and I still think it's a very nice app. But Twitterrific edges it for me on mute filters. Both have UI pros and cons - Tweetbot is more polished, allows images to be disabled, and has a better dark mode implementation but has some odd line spacing bugs (which have been in the last couple of versions too). Twitterrific has more font choices and (for me) a better menu bar implementation.