Thank you for your question and welcome to AnxietyConnection.com.
I am not a medical professional and would not be able to give you medical advice.
Ativan and Xanax are two different medications. It is impossible to compare the strength of medications that contain different ingredients.
For further information:
If you have questions about your medications, you should discuss with your doctor. He or she would be better able to answer your concerns.
My personal experience tells me that Xanax is actually quite a bit stronger than Ativan per MG. For me Xanax was more addictive and has more severe withdrawl symptoms ( can last 60 days if you dose 4+ MG of Xanax per day - sleeplessness, etc...beware.)