I just realized that I didn't answer your question -- which medication is right for you?
The answer requires a knowledge of your pain condition and medical history, so let me answer in general. But before I start, remember this:
the decision to enter into chronic opioid therapy (COT) is not to be taken lightly. While opioid analgesics can be effective for some chronic pain, for certain pain syndromes, it does not relieve much pain.