They're all good, it depends on what you're looking for more - anxiety problems, or help with sleep. For the former, alprazolam (xanax) , clonaz (kpins) are probably best, while for sedation try and get temazepam or nitrazepam. Diaz (valium) is fairly balanced. They all act very similarly though, so between benzos there won't be a huge difference, any of them would work.