Well, my favorite opiate varies by method of administration, by IV (As I am not a heroin user) It would probably have to be Dilaudid (Hydromorphone), By smoking it would have to be dried Fentanyl powder, and lastly insuffilated (by nose), or by mouth it would probably have to be Oxycodone. And as for the second part of your question... Klonopin is not an opiate, it is a benzodiazepine, which is used for relief of anxiety, not for pain. And it gives more of a calming feeling, not much euphoria. Whereas the oxycodone is a schedule II narcotic opiate agonist analgesic, and is a quite potent opiate that does produce a strong feeling of euphoria and does provide pain relief. Given the decision between the two I would most definately choose the oxycodone.
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I am not a doctor, or a medical professional. For medical advice you should always consult your doctor, or a qualified medical professional.