Hello Mr. Sleeping pills are addictive in nature , u must avoid using them without supervision and consultation of particularly ,. Only Psychiatrist. And also , the reason for ur sleep disturbances has to be addressed  clearly ,depending upon which , we can plan a medicine or therapies or both.

Only take medicine after consultation.

Don’t take any of these medicines without consulting a psychiatrist. There can be many causes of sleep disturbance.

There is nothing like powerful between medicines you mentioned. It all depends on patients symptoms and requirement. Sometimes one patient may feel good on alprax, other one on Ativan. Some medicines required to  initiate sleep, some required to maintain sleep, some regularize your sleep pattern. Every medicines has its effects and side effects. But these medicines are addictive and no one should take them without consulting a Psychiatrist.