xanax is not the strongest benzo out there.It is just fast acting and its effects are noticed sooner.flunitrazepam is the strongest benzo that is available.There are stronger ones that are not available.Klonopin last much longer than xanax,and some people think it is stronger because it lasts so long.but it doesnt even last as long as valium,which we all know is not very strong.The purple xanax are awsome but I havent seen them for years.They worked best for my panic disorder amazingly.