Here.. check out this page(It is a benzo comparison chart, similiar to the opiate one)...http://www.pharmer.org/node/10024
Midazolam or Flunitrazepam Xanax, haha, yeah right. If you are talking about the strongest mg for mg, as in what is the strongest pill for the amount you have to take, I have no idea. As far as what the strongest benzo would be in terms of fucking you up, those two I posted are about as hardcore as you are gonna get on benzos. Yes, roofies ARE a benzo, I bet tons of people had no idea.