Clonazepam is ten times more potent, so the equivalent dose is ten times less than that of Diazepam. Of course, these equivalency seems to vary from one person to another.
There are less toxicity issues with the newer benzos that require smaller doses. Another advantage is that, requiring smaller doses, the potential for addiction is reduced. Which does not mean there aren't any addiction or dependency concerns with Clonazepam.
Clonazepam makes you sleepy, though, so if you really must take a benzo for anxiety, I'd recommend Xanax. But only if you really must. The dependency risk is the same for all.