hi. both are high potency. klonopin lasts longer, but it also takes longer to feel the full effects. long-term, klonopin is more likely to cause depression or make depression worse. xanax has been used in some forms of depression, but i think that use is frowned upon now (high doses were used).

tapering klonopin or xanax can be difficult. i dont think either one is all that great as a sleeping pill, but id take xanax over klonopin for night time use, personally. ativan worked reasonably well for me for sleep. its high(ish) potency, more sedating than klonopin, lasts a bit longer than xanax, good for agitation.

hope this helps.