Answering for myself not the OP but of the three I preferred the stock client over tweetian and found Rocket too unreliable. Notifications never seemed to work for me with Rocket and I didn't like the UI on Tweetian on the N9. It seemed a bit out of place with the N9 UI.

The only real problem with the native client was the thumbnail cache used to get clogged up after a while and you had to delete it manually to keep it running at a decent speed.