I changed to Twitterrific on both, iPhone and iPad, and keep using Tweetbot on my Mac. The option to have the streams synchronized on my device isn't that important to me - however, I love watching some TV shows together with Twitter open as the second screen and Twitterrific automatically scrolls the new incoming tweets in real time, a feature that I missed on Tweetbot anyway. To cut a long story short, I always thought Tweetbot is the #1 for me, but not updating the iPad app cosmetically to iOS 7/8 for two freaking years or so eventually drove me into the arms of the competition. I waited really, really, REALLY patient for such an update, but this is simply ridiculous.