I've been on all of them. I'm not sure any are weaker than others but Klonopin has a long half life and Xanax has a short one. I think Valium is in between. I was on benzos for 30 years but a nurse forced me off them and I have withdrawal syndrome (18 months going still). :-( I feel awful all the time and the anxiety is crippling. The deep breathing is hard because I have COPD. It's awful. They are wonderful drugs until someone decides to force you off them against your will.