Suchandra, I can't speak to the pros and cons. Both of the procedures you're describing involve deliberate damage to the nerves, just by different means. I've had direct ON blocks using steroids and anesthetic that calmed the nerves for awhile, but they can only be done so many times in a fixed period of time. The RFA I underwent was in the facet joint nerves and my doctor was hoping that it would help the ON by stopping the muscle spams and tension.

Before you go through with any procedure, please make sure the doctor goes over the risks and complications. In the US they have to get informed consent. I don't know how things are done in your country, but once the RFA is done, there is a high probability that when the pain returns, it will be worse than before it was done and since its a destructive procedure, it will have to be repeated. Take care and welcome to the forum.