tweet attacks pro. twitter finds a way to detect everything everytime so pick up TA cause you can spam the hell out of it easier, tweetadder is better for growing bigger followed accounts but you have to make a lot trial and error and twitter will probably get you at some point anyway...
While that is true that the twitter attacks does get a lot of twitter accounts banned (mostly because it's so damn fast at spamming).
The best way to get around that and get a really high success rate is to make massive accounts with proxy. Then start tweeting slowly with different links and tweets.
I've been able to get a lot of traffic that way, but really have no use for it since I do mostly niche websites now.