First off - all benzo's (Valium, Xanax, Klonapin) are all very addictive, so just be careful.
Now - Klonapin has the longest 1/2 life of all the Benzo's which makes it the choice script cause it takes a little while to "slowly" kick-in (which makes it a better choice than Val, or Xan) with Valium or Xanax - the relief is quick - which makes them more mentally satisfying as a "quick-fix" - however - with the shorter 1/2-life - you need to take them more often then the Klon.
Long story short - Use Klonapin - it's "easily" the best choice and you will find that you need less and the results are steady and moderate - not quick and intense.
Good Drug for Anxiety