clonazepam (klonopin/rovitrol) is my personal favorite for anxiety.
Valium is probably my favorite followed closely by klonopin. I really hate xanax. Those are the only 3 benzos I've tried though, there are some more interesting ones out there from what I hear.
Valium barely works on me. Xanax is similar to Klonopin, but is more sedating and shorter-acting. Alprozolam and Temazepam are most likely the two most addictive (at least of common) benzos.
This is because of the short half life. Also, when i say addictive, i am referring to physical, but mental addiction is much more common on xanax than on valium (because valium is more gentle and longer lasting).
Oh, and ive wondered about Buspar, every doc ive asked has said its a BS drug given to people who are prone to drinking, because with the other anxiolytics, alcohol is contraindicated. I've also taken it, just for anxiety relief, not to get high (well.. there IS no high).
The only feeling it gives you, i find is similar to smoking Calea. No high, but a subtle relaxation, but def way too subtle to get rid of any _real_ anxiety. In fact, I think calea is a better anxiolytic, which says alot about just how useless buspare is, IMO/E