I could be mistaken, but it looks like the pc drug review link given above states <u>exactly</u> same information for ativan, xanax and valium.
no attempt is given to differentiate between these three, so my point is, don't assume all three are the same.
they do indeed have little chemical differences that make them work a little better or worse for people.
i've used all three and they are as different as night and day for me (all good!)