Good luck finding a doctor to prescribe you benzodiazepines. I reccommend consulting the doctor, if possible, before you pay them to make sure they are compatible with you needs.
The negative stuff mentioned about benzodiazepine withdrawal is true. In fact, I've heard that amoung all drugs, benzodiazepines(especially xanax) rank amoung the worst in terms of withdrawal symptoms. Panic attacks are common, seizures are possible, but it depends on the variables like individual,dose,length of use,etc.. There are methods used to minimize these symptoms, for example, tapering, or substiting another drug. In my opinion this is no reason to hold back from using benzos, just something to consider and be aware of.
I also am pretty sure the differences between benzodiazepines scope beyond half-lives. For example, active metabolities, receptors, and probably much more.